Sayyidah Umm Hani (may Allah be pleased with her) said: On the day of the Conquest of Makkah, the Messenger of Allah (peace and blessings be upon him) came to me. He (peace and blessings be upon him) took a bath and, wrapped in a single garment, prayed eight rak'ahs. Then I said: "O Messenger of Allah! I have granted protection to two of my in-laws, and my brother has said that he will kill him" (she meant Ali (may Allah be pleased with him)). He (peace and blessings be upon him) said: "O Umm Hani! We too have granted protection to whomever you granted protection."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 21377