Musnad Ahmad 1272:10

Ishaq narrated to us, he said: Malik informed me, from Abu al-Nadr, that Abu Murrah, the freed slave of Umm Hani bint Abi Talib, informed him that he heard Umm Hani say: I went to the Messenger of Allah (peace and blessings of Allah be upon him) in the year of the Conquest, and I found him bathing, while Fatimah, his daughter, was screening him with a garment. She said: So I greeted him, and he said: "Who is this?" She said: I said, "Umm Hani bint Abi Talib." He said: "Welcome, Umm Hani." She said: When he finished his bath, he stood and prayed eight rak'ahs, wrapped in a single garment, then he turned away. I said: "O Messenger of Allah, the son of my mother claims that he is going to kill a man whom I have granted protection, so-and-so son of Hubayrah." He said: "We have granted protection to whom you have granted protection, O Umm Hani." Umm Hani said: And that was in the forenoon.