Sahih Bukhari Volume 004, Book 056, Hadith Number 773.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 56. Virtues and Merits of the Prophets (PBUH) and his Companions
Narated By Anas bin Malik : I saw Allah's Apostle at the 'time when the Asr prayer was due. Then the people were searching for water for ablution but they could not find any. Then some water was brought to Allah's Apostle and he placed his hand in the pot and ordered the people to perform the ablution with the water. I saw water flowing from underneath his fingers and the people started performing the ablution till all of them did it.