Sahih Bukhari Volume 7, Book 69, Hadith Number 543.

Narrated By Jabir bin ‘Abdullah : I was with the Prophet and the time for the ‘Asr prayer became due. We had no water with us except a little which was put in a vessel and was brought to the Prophet. He put his hand into it and spread out his fingers and then said, “Come along! Hurry up! All those who want to perform ablution. The blessing is from Allah.” I saw the water gushing out from his fingers. So the people performed the ablution and drank, and I tried to drink more of that water (beyond my thirst and capacity), for I knew that it was a blessing. The sub-narrator said: I asked Jabir, “How many persons were you then?” He replied, “We were one-thousand four hundred men.” Salim said: Jabir said, 1500.