Sahih Muslim 2279 c
Anas b. Malik reported that Allah's Apostle (ﷺ) and his Companions were at a place known as az-Zaura' (az-Zaurd' is a place in the bazar of Medina near the mosque) that he called for a vessel containing water. He put his hand in that. And there began to spout (water) between his fingers and all the Companions performed ablution. Qatada, one of the narrators in the chain of narrators, said:
Abu Hamza (the kunya of Hadrat Anas b. Malik), how many people were they? He said: They were about three hundred.
حَدَّثَنِي أَبُو غَسَّانَ الْمِسْمَعِيُّ، حَدَّثَنَا مُعَاذٌ، - يَعْنِي ابْنَ هِشَامٍ - حَدَّثَنِي أَبِي، عَنْ 
 قَتَادَةَ، حَدَّثَنَا أَنَسُ بْنُ مَالِكٍ، أَنَّ نَبِيَّ اللَّهِ صلى الله عليه وسلم وَأَصْحَابَهُ بِالزَّوْرَاءِ - قَالَ
 وَالزَّوْرَاءُ بِالْمَدِينَةِ عِنْدَ السُّوقِ وَالْمَسْجِدِ فِيمَا ثَمَّهْ - دَعَا بِقَدَحٍ فِيهِ مَاءٌ فَوَضَعَ كَفَّهُ فِيهِ
 فَجَعَلَ يَنْبُعُ مِنْ بَيْنِ أَصَابِعِهِ فَتَوَضَّأَ جَمِيعُ أَصْحَابِهِ ‏.‏ قَالَ قُلْتُ كَمْ كَانُوا يَا أَبَا حَمْزَةَ
 قَالَ كَانُوا زُهَاءَ الثَّلاَثِمِائَةِ ‏.‏