Language:
كتاب الوضوء
4
Ablutions (Wudu')
(45)
Chapter: To take a bath or perform ablution from a Mikhdab (utensil), a tumbler, or a wooden or stone pot
(45)
باب الْغُسْلِ وَالْوُضُوءِ فِي الْمِخْضَبِ وَالْقَدَحِ وَالْخَشَبِ وَالْحِجَارَةِ

Narrated Anas:

It was the time for prayer, and those whose houses were near got up and went to their people (to perform ablution), and there remained some people (sitting). Then a painted stove pot (Mikhdab) containing water was brought to Allah's Messenger (ﷺ)s The pot was small, not broad enough for one to spread one's hand in; yet all the people performed ablution. (The sub narrator said, "We asked Anas, 'How many persons were you?' Anas replied 'We were eighty or more"). (It was one of the miracles of Allah's Messenger (ﷺ)).

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُنِيرٍ، سَمِعَ عَبْدَ اللَّهِ بْنَ بَكْرٍ، قَالَ حَدَّثَنَا حُمَيْدٌ، عَنْ أَنَسٍ، قَالَ حَضَرَتِ الصَّلاَةُ، فَقَامَ مَنْ كَانَ قَرِيبَ الدَّارِ إِلَى أَهْلِهِ، وَبَقِيَ قَوْمٌ، فَأُتِيَ رَسُولُ اللَّهِ صلى الله عليه وسلم بِمِخْضَبٍ مِنْ حِجَارَةٍ فِيهِ مَاءٌ، فَصَغُرَ الْمِخْضَبُ أَنْ يَبْسُطَ فِيهِ كَفَّهُ، فَتَوَضَّأَ الْقَوْمُ كُلُّهُمْ‏.‏ قُلْنَا كَمْ كُنْتُمْ قَالَ ثَمَانِينَ وَزِيَادَةً‏.‏
Reference : Sahih al-Bukhari 195
In-book reference : Book 4, Hadith 61
USC-MSA web (English) reference : Vol. 1, Book 4, Hadith 194
  (deprecated numbering scheme)