Musannaf Ibn Abi Shaybah

Hazrat Anas bin Malik (may Allah be pleased with him) narrates that the time for prayer arrived and those who were near the mosque stood up and performed ablution, while some people remained. Then a stone vessel containing water was brought to the Messenger of Allah (peace and blessings be upon him). He placed his hand in it; it was so small that he could not spread out his hand. He joined his fingers together, and all the people performed ablution. The narrator says that we asked how many people there were. He replied that there were eighty men.