السنن الكبرى للبيهقي
Sunan al-Kubra al-Bayhaqi
كتاب الزكاة
Book of Zakah
باب: ما دل على أن صاع النبي صلى الله عليه وسلم كان عياره خمسة أرطال وثلث.
Evidence that the sa' of the Prophet (peace and blessings be upon him) measured five and a third ratls
Toggle above to switch between keyword search and direct hadith lookup
أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ، أنبأ مُحَمَّدُ بْنُ يَعْقُوبَ، ثنا مُحَمَّدُ بْنُ نُعَيْمٍ، وَأَحْمَدُ بْنُ سَهْلٍ، قَالَا: ثنا ابْنُ أَبِي عُمَرَ، ثنا سُفْيَانُ، عَنِ ابْنِ أَبِي نَجِيحٍ، وَأَيُّوبَ، وَحُمَيْدٌ، وَعَبْدُ الْكَرِيمِ، عَنْ مُجَاهِدٍ، عَنِ ابْنِ أَبِي لَيْلَى، عَنْ كَعْبِ بْنِ عُجْرَةَ، أَنَّ رَسُولَ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ مَرَّ بِهِ ⦗٢٨٦⦘ وَهُوَ بِالْحُدَيْبِيَةِ قَبْلَ أَنْ يَدْخُلَ مَكَّةَ وَهُوَ مُحْرِمٌ وَهُوَ يُوقِدُ تَحْتَ قِدْرٍ لَهُ، وَالْقَمْلُ يَتَهَافَتُ عَلَى وَجْهِهِ، فَقَالَ: " أَتُؤْذِيكَ هَوَامُّكَ هَذِهِ "، قُلْتُ: نَعَمْ، قَالَ: " فَاحْلِقْ رَأْسَكَ وَأَطْعِمْ فَرَقًا بَيْنَ سِتَّةِ مَسَاكِينَ " وَالْفَرَقُ ثَلَاثَةُ آصُعٍ " أَوْ صُمْ ثَلَاثَةَ أَيَّامٍ، أَوِ انْسُكْ نَسِيكَةً ". وَقَالَ ابْنُ أَبِي نَجِيحٍ: أَوِ اذْبَحْ شَاةً. رَوَاهُ مُسْلِمٌ فِي الصَّحِيحِ عَنِ ابْنِ أَبِي عُمَرَ وَأَخْرَجَهُ الْبُخَارِيُّ مِنْ حَدِيثِ ابْنِ أَبِي نَجِيحٍ، وَأَيُّوبَ، وَسَيْفِ بْنِ سُلَيْمَانَ، وَغَيْرِهِمْ عَنْ مُجَاهِدٍ.
Sayyiduna Ka'b bin Ujrah (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) passed by him while he was at al-Hudaybiyah, before entering Makkah, in the state of ihram, lighting a fire under his cooking pot, with lice falling onto his face. He (peace and blessings be upon him) said: "Are these vermin of yours troubling you?" I said: Yes. He (peace and blessings be upon him) said: "Then shave your head and feed six poor people a faraq (basket) of dates, and a faraq is three sa's; or fast three days, or offer a sacrifice." Ibn Abi Najih said: "or slaughter a sheep."
وَأَخْبَرَنَا أَبُو عَلِيٍّ الرُّوذْبَارِيُّ، فِيمَا قُرِئَ عَلَيْهِ مِنْ كِتَابٍ مُعَارَضٍ بِأَصْلِهِ أنبأ أَبُو بَكْرٍ مُحَمَّدُ بْنُ بكرٍ، ثنا أَبُو دَاوُدَ السِّجِسْتَانِيُّ، قَالَ: سَمِعْتُ أَحْمَدَ بْنَ حَنْبَلٍ يَقُولُ: " الْفَرَقُ سِتَّةَ عَشَرَ رِطْلًا "، وَسَمِعْتُهُ يَقُولُ: " صَاعُ ابْنِ أَبِي ذِئْبٍ خَمْسَةُ أَرْطَالٍ وَثُلُثٌ ". قَالَ: فَمَنْ قَالَ: ثَمَانِيَةُ أَرْطَالٍ؟ قَالَ: لَيْسَ ذَلِكَ بِمَحْفُوظٍ.
Abu Dawud al-Sijistani (may Allah have mercy on him) says: I heard Ahmad bin Hanbal (may Allah have mercy on him) say: "The faraq is sixteen ratls," and I heard him say: "The sa' of Ibn Abi Dhi'b is five and a third ratls." He was asked: What about the one who said eight ratls? He said: That is not preserved.
أَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ، أَخْبَرَنِي أَبُو الْقَاسِمِ عَبْدُ الرَّحْمَنِ بْنُ أَحْمَدَ الْحِمْيَرِيُّ، ثنا الْحَسَنُ بْنُ الْحُسَيْنِ بْنِ مَنْصُورٍ، ثنا أَبُو أَحْمَدَ مُحَمَّدُ بْنُ عَبْدِ الْوَهَّابِ، قَالَ: سَمِعْتُ أَبِي يَقُولُ: سَأَلَ أَبُو يُوسُفَ مَالِكًا عِنْدَ أَمِيرِ الْمُؤْمِنْينَ عَنِ الصَّاعِ، كَمْ هُوَ رِطْلًا؟ قَالَ: السُّنَّةُ عِنْدَنَا أَنَّ الصَّاعَ لَا يُرْطَلُ، فَفَحَمَهُ، قَالَ أَبُو أَحْمَدَ: سَمِعْتُ الْحُسَيْنَ بْنَ الْوَلِيدِ يَقُولُ: قَالَ أَبُو يُوسُفَ: " فَقَدِمْتُ الْمَدِينَةَ فَجَمَعْنَا أَبْنَاءَ أَصْحَابِ رَسُولِ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ، وَدَعَوْتُ بِصَاعَاتِهِمْ، فَكُلٌّ حَدَّثَنِي عَنْ آبَائِهِمْ عَنْ رَسُولِ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ أَنَّ هَذَا صَاعُهُ فَقَدَّرْتُهَا فَوَجَدْتُهَا مُسْتَوِيَةً، فَتَرَكْتُ قَوْلَ أَبِي حَنِيفَةَ، وَرَجَعْتُ إِلَى هَذَا ".
Abu Ahmad Muhammad bin Abd al-Wahhab (may Allah have mercy on him) relates: I heard my father say: Imam Abu Yusuf (may Allah have mercy on him) asked Imam Malik (may Allah have mercy on him), in the presence of the Commander of the Faithful, how many ratls the sa' is. He replied: The Sunnah with us is that the sa' is not measured in ratls; and with this answer he silenced him. Abu Ahmad says: I heard Husayn bin al-Walid say that Imam Abu Yusuf (may Allah have mercy on him) said: When I came to Madinah, I gathered the sons of the Companions of the Messenger (peace and blessings be upon him) and had all their sa's brought; each of them related from the Messenger of Allah (peace and blessings be upon him) that this is that sa'. I found all their sa's to be equal. So I abandoned the view of Imam Abu Hanifah (may Allah have mercy on him) and turned to this.
وَأَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ، حدَّثَنِي عَبْدُ اللهِ بْنُ سَعْدٍ الْحَافِظُ، ثنا أَحْمَدُ بْنُ إِبْرَاهِيمَ بْنِ عَبْدِ اللهِ، ثنا الْحُسَيْنُ بْنُ مَنْصُورٍ، ثنا الْحُسَيْنُ بْنُ الْوَلِيدِ، قَالَ: قَدِمَ عَلَيْنَا أَبُو يُوسُفَ مِنَ الْحَجِّ، فَأَتَيْنَاهُ، فَقَالَ: " إِنِّي أُرِيدُ أَنْ أَفْتَحَ عَلَيْكُمْ بَابًا مِنَ الْعِلْمِ هَمَّنِي، تَفَحَّصْتُ عَنْهُ فَقَدِمْتُ الْمَدِينَةَ فَسَأَلْتُ عَنِ الصَّاعِ، فَقَالُوا: صَاعُنَا هَذَا صَاعُ رَسُولِ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ، قُلْتُ لَهُمْ: مَا حُجَّتُكُمْ فِي ذَلِكَ؟ فَقَالُوا: نَأْتِيكَ بِالْحُجَّةِ غَدًا، فَلَمَّا أَصْبَحْتُ أَتَانِي نَحْوٌ مِنْ خَمْسِينَ شَيْخًا مِنْ أَبْنَاءِ الْمُهَاجِرِينَ وَالْأَنْصَارِ، مَعَ كُلِّ رَجُلٍ مِنْهُمُ الصَّاعُ تَحْتَ رِدَائِهِ، كُلُّ رَجُلٍ مِنْهُمْ يُخْبِرُ عَنْ أَبِيهِ أَوْ أَهْلِ بَيْتِهِ أَنَّ هَذَا صَاعُ رَسُولِ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ فَنَظَرْتُ فَإِذَا هِيَ سَوَاءٌ، قَالَ: فَعَايَرْتُهُ فَإِذَا هُوَ خَمْسَةُ أَرْطَالٍ وَثُلُثٌ بِنُقْصَانٍ مَعَهُ يَسِيرٍ، فَرَأَيْتُ أَمْرًا قَوِيًّا فَقَدْ تَرَكْتُ قَوْلَ أَبِي حَنِيفَةَ فِي الصَّاعِ، وَأَخَذْتُ بِقَوْلِ أَهْلِ الْمَدِينَةِ " قَالَ الْحُسَيْنُ: فَحَجَجْتُ مِنْ عَامِي ذَلِكَ فَلَقِيتُ مَالِكَ بْنَ أَنَسٍ، فَسَأَلْتُهُ عَنِ الصَّاعِ، فَقَالَ: صَاعُنَا هَذَا صَاعُ رَسُولِ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ، فَقُلْتُ: كَمْ رِطْلًا هُوَ؟ قَالَ: إِنَّ الْمِكْيَالَ لَا يُرْطَلُ، هُوَ هَذَا. ⦗٢٨٧⦘ قَالَ الْحُسَيْنُ: فَلَقِيتُ عَبْدَ اللهِ بْنَ زَيْدِ بْنِ أَسْلَمَ، فَقَالَ: حَدَّثَنِي أَبِي عَنْ جَدِّي أَنَّ هَذَا صَاعُ عُمَرَ رَضِيَ اللهُ عَنْهُ.
Husayn bin al-Walid (may Allah have mercy on him) says: Abu Yusuf (may Allah have mercy on him) came to us on his return from Hajj and said: I want to open for you a door of knowledge that concerned me. I investigated it: I came to Madinah and asked about the sa', and they said: This sa' of ours is the sa' of the Messenger of Allah (peace and blessings be upon him). I said to them: What is your proof? They said: We will bring you its proof tomorrow. The next morning about fifty shaykhs came to me, sons of the Muhajirun and the Ansar, each of them with a sa' under his cloak, and each of them was reporting from his father or his household that this is the sa' of the Messenger of Allah (peace and blessings be upon him). When I looked, I found them all equal, and it was five and a third ratls, slightly less. So I considered it strong, abandoned the view of Abu Hanifah (may Allah have mercy on him), and accepted the view of the people of Madinah.
Husayn (may Allah have mercy on him) says: I performed Hajj that same year and met Imam Malik bin Anas (may Allah have mercy on him). I asked him about the sa', and he said: This sa' of ours is indeed the sa' of the Messenger of Allah (peace and blessings be upon him). I asked: How many ratls is it? He said: A measure of volume is not reckoned in ratls. Husayn (may Allah have mercy on him) says: Then I met Abdullah bin Zayd bin Aslam (may Allah have mercy on him), and he said: My father told me from my grandfather that this is the sa' of Sayyiduna Umar (may Allah be pleased with him).
Husayn (may Allah have mercy on him) says: I performed Hajj that same year and met Imam Malik bin Anas (may Allah have mercy on him). I asked him about the sa', and he said: This sa' of ours is indeed the sa' of the Messenger of Allah (peace and blessings be upon him). I asked: How many ratls is it? He said: A measure of volume is not reckoned in ratls. Husayn (may Allah have mercy on him) says: Then I met Abdullah bin Zayd bin Aslam (may Allah have mercy on him), and he said: My father told me from my grandfather that this is the sa' of Sayyiduna Umar (may Allah be pleased with him).
وَأَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ، أَخْبَرَنِي أَبُو حَامِدٍ أَحْمَدُ بْنُ مُحَمَّدِ بْنِ الْحَسَنِ الْخُسْرَوَجُرْدِيُّ، ثنا دَاوُدُ بْنُ الْحُسَيْنِ، قَالَ: سَمِعْتُ مُحَمَّدَ بْنَ سَعْدٍ الْجَلَّابُ، يَقُولُ: سَأَلْتُ إِسْمَاعِيلَ بْنَ أَبِي أُوَيْسٍ بِالْمَدِينَةِ، عَنْ صَاعِ النَّبِيِّ، صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ " فَأَخْرَجَ إِلَيَّ صَاعًا عَتِيقًا بَالِيًا، فَقَالَ: هَذَا صَاعُ النَّبِيِّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ بِعَيْنِهِ فَعَيَّرْتُهُ فَكَانَ خَمْسَةَ أَرْطَالٍ وَثُلُثًا ".
Muhammad bin Sa'd al-Jallab says: In Madinah I asked Isma'il bin Abi Uways about the sa' of the Prophet (peace and blessings be upon him), and he brought out an old sa' and said: This is the very sa' of the Prophet (peace and blessings be upon him). I measured it, and it was five and a third ratls.
وَأَخْبَرَنَا أَبُو عَبْدِ اللهِ الْحَافِظُ، قَالَ: قَرَأْتُ بِخَطِّ أَبِي عَمْرٍو الْمُسْتَمْلِي، سَمِعْتُ مُحَمَّدَ بْنَ يَحْيَى يَعْنِي الذُّهْلِيَّ، يَقُولُ: " اسْتَعَرْتُ مِنْ إِسْمَاعِيلَ بْنِ أَبِي أُوَيْسٍ صَاعَ مَالِكِ بْنِ أَنَسٍ، فَوَجَدْتُ عَلَيْهِ مَكْتُوبًا صَاعُ مَالِكِ بْنِ أَنَسٍ، مُعَيَّرٌ عَلَى صَاعِ النَّبِيِّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ، وَلَا أَحْسَبُنِي إِلَّا عَيَّرْتُهُ بِالْعَدَسِ، فَوَجَدْتُهُ خَمْسَةَ أَرْطَالٍ وَثُلُثًا ".
Muhammad bin Yahya, that is al-Dhuhli (may Allah have mercy on him), says: "I borrowed the sa' of Malik bin Anas from Isma'il bin Abi Uways, and I found written on it: 'The sa' of Malik bin Anas, calibrated to the sa' of the Prophet (peace and blessings be upon him).' I believe I calibrated it with lentils, and I found it to be five and a third ratls."
أَخْبَرَنَا مُحَمَّدُ بْنُ عَبْدِ اللهِ الْحَافِظُ، ثنا أَبُو الْعَبَّاسِ مُحَمَّدُ بْنُ يَعْقُوبَ، ثنا الرَّبِيعُ بْنُ سُلَيْمَانَ، ثنا الْخَصِيبُ بْنُ نَاصِحٍ، عَنْ عَبْدِ اللهِ بْنِ جَعْفَرٍ الْمَدِينِيِّ، عَنِ الْعَلَاءِ بْنِ عَبْدِ الرَّحْمَنِ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ لِرَسُولِ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ يَا رَسُولَ اللهِ إِنَّ صَاعَنَا أَصْغَرُ الصِّيعَانِ، وَمُدَّنَا أَصْغَرُ الْأَمْدَادِ، فَقَالَ رَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ: " اللهُمَّ بَارِكْ لَنَا فِي صَاعِنَا وَمُدِّنَا وَقَلِيلِنَا وَكَثِيرِنَا، وَاجْعَلْ لَنَا مَعَ الْبَرَكَةِ بَرَكَتَيْنِ، اللهُمَّ إَنَّ إِبْرَاهِيمَ عَبْدَكَ وَخَلِيلَكَ دَعَاكَ لِأَهْلِ مَكَّةَ وَإِنِّي عَبْدُكَ وَرَسُولُكَ أَدْعُوكَ لِأَهْلِ الْمَدِينَةِ بِمِثْلِ مَا دَعَاكَ بِهِ إِبْرَاهِيمُ لِأَهْلِ مَكَّةَ ". وَالَّذِي رَوَاهُ صَالِحُ بْنُ مُوسَى الطَّلْحِيُّ، عَنْ مَنْصُورٍ، عَنْ إِبْرَاهِيمَ، عَنِ الْأَسْوَدِ، عَنْ عَائِشَةَ رَضِيَ اللهُ عَنْهَا جَرَتِ السُّنَّةُ مِنْ رَسُولِ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ فِي الْغُسْلِ مِنَ الْجَنَابَةِ صَاعٌ وَالْوُضُوءُ رَطْلَيْنِ وَالصَّاعُ ثَمَانِيَةُ أَرْطَالٍ، فَإِنَّ صَالِحًا يَتَفَرَّدُ بِهِ وَهُوَ ضَعِيفُ الْحَدِيثِ، قَالَهُ يَحْيَى بْنُ مَعِينٍ وَغَيْرُهُ مِنْ أَهْلِ الْعِلْمِ بِالْحَدِيثِ، وَكَذَلِكَ مَا رُوِيَ عَنْ جَرِيرِ بْنِ يَزِيدَ، عَنْ أَنَسِ بْنِ مَالِكٍ وَمَا رُوِيَ عَنِ ابْنِ أَبِي لَيْلَةَ عَنْ عَبْدِ الْكَرِيمِ عَنْ أَنَسِ بْنِ مَالِكٍ رَضِيَ اللهُ عَنْهُ، عَنِ النَّبِيِّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ كَانَ يَتَوَضَّأُ بِرَطْلَيْنِ وَيَغْتَسِلُ بِالصَّاعِ، ثَمَانِيَةُ أَرْطَالٍ إِسْنَادُهُمَا ضَعِيفٌ وَالصَّحِيحُ عَنْ أَنَسِ بْنِ مَالِكٍ كَانَ رَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ يَتَوَضَّأُ بِالْمُدِّ وَيَغْتَسِلُ بِالصَّاعِ إِلَى ⦗٢٨٨⦘ خَمْسَةِ أَمْدَادٍ، ثُمَّ قَدْ أَخْبَرَتْ أَسْمَاءُ بِنْتُ أَبِي بَكْرٍ أَنَّهُمْ كَانُوا يُخْرِجُونَ زَكَاةَ الْفِطْرِ بِالصَّاعِ الَّذِي يَقْتَاتُونَ بِهِ فَدَلَّ ذَلِكَ عَلَى مُخَالَفَةِ صَاعِ الزَّكَاةِ وَالْقُوتِ صَاعَ الْغُسْلِ. ثُمَّ قَدْ رَوَتْ عَائِشَةُ رَضِيَ اللهُ عَنْهَا أَنَّهَا كَانَتْ تَغْتَسِلُ هِيَ وَرَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ مِنْ إِنَاءٍ قَدْرَ الْفَرَقِ، وَقَدْ دَلَّلْنَا عَلَى أَنَّ الْفَرَقَ ثَلَاثَةُ آصُعٍ، فَإِذَا كَانَ الصَّاعُ خَمْسَةَ أَرْطَالٍ وَثُلُثًا، كَانَ قَدْرُ مَا يَغْتَسِلُ بِهِ كُلُّ وَاحِدٍ مِنْهُمَا ثَمَانِيَةَ أَرْطَالٍ وَهُوَ صَاعٌ وَنِصْفٌ، وَقَدْرُ مَا يَغْتَسِلُ بِهِ كَانَ يَخْتَلِفُ بِاخْتِلَافِ الِاسْتِعْمَالِ فَلَا مَعْنَى لِتَرْكِ الْأَحَادِيثِ الصَّحِيحَةِ فِي قَدْرِ الصَّاعِ الْمُعَدِّ لِزَكَاةِ الْفِطْرِ بِمِثْلِ هَذَا وَبِاللهِ التَّوْفِيقُ.
Sayyiduna Abu Hurayrah (may Allah be pleased with him) says that the people said to the Messenger of Allah (peace and blessings be upon him): O Messenger of Allah, our sa' is the smallest of all sa's and our mudd is the smallest of all mudds. The Messenger of Allah (peace and blessings be upon him) said: "O Allah, bless us in our sa' and our mudd, in our little and our much, and grant us two blessings along with the blessing. O Allah, Ibrahim, Your servant and Your intimate friend, prayed to You for the people of Makkah, and I, Your servant and Your Messenger, pray to You for the people of Madinah with the like of what Ibrahim prayed for the people of Makkah."
As for what Salih bin Musa al-Talhi narrated from Sayyidah Aishah (may Allah be pleased with her), that the Sunnah of the Messenger of Allah (peace and blessings be upon him) in the bath for major ritual impurity (janabah) was a sa' (of water), and for ablution two ratls, and that the sa' is eight ratls: Salih is alone in narrating it, and he is da'if (weak) in hadith; Yahya bin Ma'in and other scholars of hadith said so.
Likewise what was narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him), that the Prophet (peace and blessings be upon him) performed ablution with two ratls and the ritual bath with a sa', which is eight ratls: the chains of both are weak. The authentic report from Anas is that he (peace and blessings be upon him) used to perform ablution with a mudd and the ritual bath with a sa', up to five mudds.
Then Sayyidah Asma bint Abi Bakr (may Allah be pleased with her) related that they used to give sadaqat al-fitr with the sa' by which they measured their food.
This shows that the sa' of zakah and of food differs from the sa' of the ritual bath. Then Sayyidah Aishah (may Allah be pleased with her) related that she and the Messenger of Allah (peace and blessings be upon him) used to bathe from one vessel the size of a faraq, and we have shown that a faraq is three sa's. If the sa' is five and a third ratls, then the amount each of them bathed with was eight ratls, which is a sa' and a half. The amount used for the bath varied according to the usage, so there is no sense in abandoning, on account of something like this, the authentic hadiths on the size of the sa' set for sadaqat al-fitr. And success is from Allah.
As for what Salih bin Musa al-Talhi narrated from Sayyidah Aishah (may Allah be pleased with her), that the Sunnah of the Messenger of Allah (peace and blessings be upon him) in the bath for major ritual impurity (janabah) was a sa' (of water), and for ablution two ratls, and that the sa' is eight ratls: Salih is alone in narrating it, and he is da'if (weak) in hadith; Yahya bin Ma'in and other scholars of hadith said so.
Likewise what was narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him), that the Prophet (peace and blessings be upon him) performed ablution with two ratls and the ritual bath with a sa', which is eight ratls: the chains of both are weak. The authentic report from Anas is that he (peace and blessings be upon him) used to perform ablution with a mudd and the ritual bath with a sa', up to five mudds.
Then Sayyidah Asma bint Abi Bakr (may Allah be pleased with her) related that they used to give sadaqat al-fitr with the sa' by which they measured their food.
This shows that the sa' of zakah and of food differs from the sa' of the ritual bath. Then Sayyidah Aishah (may Allah be pleased with her) related that she and the Messenger of Allah (peace and blessings be upon him) used to bathe from one vessel the size of a faraq, and we have shown that a faraq is three sa's. If the sa' is five and a third ratls, then the amount each of them bathed with was eight ratls, which is a sa' and a half. The amount used for the bath varied according to the usage, so there is no sense in abandoning, on account of something like this, the authentic hadiths on the size of the sa' set for sadaqat al-fitr. And success is from Allah.
