Musnad Abu Ya'la al-Mawsili 3:164

Zakariya ibn Yahya al-Wasiti narrated to us, al-Hasan ibn Yazid al-Asamm narrated to us, he said: I heard al-Suddi saying, from Abu Abd al-Rahman al-Sulami, from Ali, he said: When Abu Talib died, I came to the Prophet and said: "Your elderly uncle has died." He said: "Go and bury him, and do not do anything until you come to me." He said: So I buried him, then I came to him. He said: "Go and perform ghusl (full ablution), and do not do anything until you come to me." He said: So I performed ghusl, then I came to him, and he supplicated for me with supplications that I would not be pleased to have the red camels or the black ones in exchange for them. He said: And Ali, when he would wash a deceased person, he would perform ghusl.