صحيح ابن خزيمه
Sahih Ibn Khuzaymah
جماع أبواب ذكر الماء الذي لا ينجس، والذي ينجس إذا خالطته نجاسةChapters on Water that is Pure and Impure
(90) بَابُ ذِكْرِ خَبَرٍ رُوِيَ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فِي إِجَازَةِ الْوُضُوءِ بِالْمُدِّ مِنَ الْمَاءِ "
Chapter 90: Report on the Prophet’s allowance of ablution with a mudd of water
Hadith Q116
أَوْهَمَ بَعْضَ الْعُلَمَاءِ أَنَّ تَوْقِيتَ الْمُدِّ مِنَ الْمَاءِ لِلْوُضُوءِ تَوْقِيتٌ لَا يَجُوزُ الْوُضُوءُ بِأَقَلَّ مِنْهُ
Some scholars have imagined that specifying the amount of one mudd of water for ablution is such a determination that it is not permissible to perform ablution with less water than this.
Hadith 116
نا مُحَمَّدُ بْنُ بَشَّارٍ ، نا عَبْدُ الرَّحْمَنِ يَعْنِي ابْنَ مَهْدِيٍّ ، نا شُعْبَةُ ، عَنْ عَبْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ بْنِ جَبْرِ بْنِ عَتِيكٍ ، قَالَ : سَمِعْتُ أَنَسَ بْنَ مَالِكٍ ، يَقُولُ : كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ " يَتَوَضَّأُ بِمَكُّوكٍ ، وَيَغْتَسِلُ بِخَمْسَةِ مَكَاكِيَّ " . قَالَ أَبُو بَكْرٍ : الْمَكُّوكُ فِي هَذَا الْخَبَرِ الْمُدُّ نَفْسُهُ
Sayyiduna Anas bin Malik (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) used to perform ablution with one mudd and take a bath with five mudd. Imam Abu Bakr (may Allah have mercy on him) says that the "makook" mentioned in this hadith refers to "mudd" itself.
