Abu Bakr ibn Abi Shaybah narrated to us, Husayn ibn Ali narrated to us, from Za'idah, who said: Amr ibn Yahya al-Ansari narrated to me, Muhammad ibn Yahya ibn Habban narrated to me, from Amr ibn Sulaym ibn Khaldah al-Ansari, from Abu Qatadah, the companion of the Messenger of Allah, peace and blessings be upon him, who said: I entered the mosque while the Messenger of Allah, peace and blessings be upon him, was sitting among the people. He said: So I sat down, and the Messenger of Allah, peace and blessings be upon him, said: "What prevented you from praying two rak'ahs before sitting down?" He said: So I said, "O Messenger of Allah, I saw you sitting and the people sitting." He said: "When one of you enters the mosque, let him not sit until he prays two rak'ahs."