It is narrated from Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) that when Abu Talib died, I came to the Messenger of Allah (peace and blessings be upon him) and said: O Messenger of Allah, your elderly uncle has died. He (peace and blessings be upon him) said to me: "Go and conceal him, and do not say anything to anyone, then come to me." I took a ritual bath, then came to him (peace and blessings be upon him), and he (peace and blessings be upon him) supplicated for me with a supplication that was dearer to me than red camels.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 1453