Musnad Ahmad 1272:8

Yahya ibn Adam narrated to us, he said: Zuhayr narrated to us, from Abdullah ibn Uthman ibn Khuthaym, he said: Yusuf ibn Mahak narrated to me that he entered upon Umm Hani bint Abi Talib, and he asked her about the entry of the Messenger of Allah (may Allah bless him and grant him peace) on the day of the Conquest. He asked her: "Did the Prophet (may Allah bless him and grant him peace) pray at your place?" She said: "He entered during the forenoon, and I poured water for him into a bowl of ours; I can still see the residue of dough in it." Yusuf said: "I do not know which of the two she told me—whether he performed ablution or performed ghusl." She continued: "Then he performed four rak'ahs in this mosque"—a mosque in her house. Yusuf said: "So I stood up and performed ablution from a water skin of hers, and I prayed four rak'ahs in that mosque."