Sahih Bukhari Volume 1, Book 4, Hadith 195

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

Narrated By 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 Apostles 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 Apostle).