Musnad Ahmad 32:1651

'Affan narrated to us, Hammad narrated to us, from Thabit, from Anas ibn Malik, who said: The time for prayer arrived, so the neighbors of the mosque stood up to perform ablution. There remained between seventy and eighty [people], and their homes were far away. The Prophet, peace and blessings of Allah be upon him, called for a basin containing water, which was not full. He placed his fingers into it and began pouring [water] upon them, saying: "Perform ablution," until they all performed ablution. There remained in the basin about the same amount that was in it [before], and they were about seventy to one hundred [people].