Musnad Ahmad 1166:22

I read this hadith to Abd al-Rahman ibn Mahdi: Malik, from Abu al-Nadr, the freed slave of Umar ibn Ubayd Allah, that Abu Murrah, the freed slave of Umm Hani, informed him that he heard Umm Hani bint Abi Talib [say that she] went to the Messenger of Allah, may Allah bless him and grant him peace, on the day of the Conquest. Then he mentioned the hadith.