Musannaf Ibn Abi Shayba 3:799

Yazid ibn Harun narrated to us, from Muhammad ibn ‘Amr, from Ibrahim ibn ‘Abdullah ibn Hunayn, from Abu Murrah, the freed slave of ‘Aqil ibn Abi Talib, from Umm Hani bint Abi Talib, who said: I came to the Messenger of Allah, may Allah bless him and grant him peace, and water was placed for him, so he performed ghusl. Then he wrapped himself in a garment and crossed its two ends over his shoulder. Then he prayed the Duha prayer, eight rak'ahs. Muhammad said: And I have seen Abu Murrah.