Musnad Ahmad 5:245

Ibrahim ibn Abi al-Abbas narrated to us, al-Hasan ibn Yazid al-Asamm narrated to us, he said: I heard al-Suddi Isma'il mentioning it from Abu 'Abd al-Rahman al-Sulami, from 'Ali, who said: When Abu Talib died, I came to the Prophet, peace and blessings of Allah be upon him, and said: "Your elderly uncle has died." He said: "Go and bury him, then 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), then do not do anything until you come to me." He said: So I performed ghusl, then I came to him. He said: He then supplicated for me with supplications that I would not be pleased to exchange for the red and black camels (i.e., all the wealth of the world). He said: And 'Ali, when he would wash a deceased person, he would perform ghusl.