Musnad Ahmad 1166:10

Yazid ibn Harun narrated to us, he said: Muhammad—meaning Ibn ‘Amr—informed us, from Ibrahim ibn ‘Abdullah ibn Hunayn, from Abu Murrah, the freed slave of Umm Hani. Muhammad said: I have seen Abu Murrah, and he was an old man who had lived during the time of Umm Hani. From Umm Hani, she said: I came to the Messenger of Allah, peace and blessings of Allah be upon him, in the year of the Conquest, and I said: "O Messenger of Allah, I have granted protection to two of my in-laws, but the son of my mother claims that he will kill them"—meaning ‘Ali. She said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "We have granted protection to whom you have granted protection, O Umm Hani." Then water was poured for the Messenger of Allah, peace and blessings of Allah be upon him, and he performed ghusl. Then he wrapped himself in a garment he had, crossing its two ends over his shoulders, and he prayed the Duha prayer, eight rak'ahs.