صحيح مسلم
Sahih Muslim
كتاب الصيام
The Book of Fasting
باب جَوَازِ صَوْمِ النَّافِلَةِ بِنِيَّةٍ مِنَ النَّهَارِ قَبْلَ الزَّوَالِ وَجَوَازِ فِطْرِ الصَّائِمِ نَفْلاً مِنْ غَيْرِ عُذْرٍ:
Chapter: It is permissible to observe a voluntary fast with an intention formed during the day before the sun reaches its Zenith, and it is permissible for one who is observing a voluntary fast to break his fast with no excuse, although it is better for him to complete it
Hadith 1154
This hadith is listed as number 2715 in Maktaba Shamila
وحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ ، حَدَّثَنَا وَكِيعٌ ، عَنْ طَلْحَةَ بْنِ يَحْيَى ، عَنْ عَمَّتِهِ عَائِشَةَ بِنْتِ طَلْحَةَ ، عَنْ عَائِشَةَ أُمِّ الْمُؤْمِنِينَ ، قَالَتْ : دَخَلَ عَلَيَّ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ذَاتَ يَوْمٍ ، فَقَالَ : " هَلْ عِنْدَكُمْ شَيْءٌ " ، فَقُلْنَا : لَا ، قَالَ : " فَإِنِّي إِذَنْ صَائِمٌ " ، ثُمَّ أَتَانَا يَوْمًا آخَرَ ، فَقُلْنَا : يَا رَسُولَ اللَّهِ ، أُهْدِيَ لَنَا حَيْسٌ ، فَقَالَ : " أَرِينِيهِ فَلَقَدْ أَصْبَحْتُ صَائِمًا ، فَأَكَلَ " .
'A'isha, the Mother of the Believers (Allah be pleased with her), reported: The Apostle of Allah (ﷺ) came to me one day and said: Is there anything with you (to eat)? I said: No. Thereupon he said: I shall then be fasting. Then he came to us another day and we said: Messenger of Allah, has been offered to us as a gift. Thereupon he said: Show that to me; I had been fasting since morning. He then ate it.
