Mu'jam Kabir Tabarani 3964 — I was with Ibn Abbas

Abdullah bin Hunayn (may Allah have mercy on him) says: I was with Ibn Abbas (may Allah be pleased with them both) and Miswar bin Makhramah (may Allah be pleased with him) at al-Abwa'. We kept talking until the two of them mentioned the muhrim washing his head. Miswar (may Allah be pleased with him) said: No; and Ibn Abbas (may Allah be pleased with them both) said: Indeed he may. So Ibn Abbas (may Allah be pleased with them both) sent me to Abu Ayyub (may Allah be pleased with him) (with this message): Your nephew Abdullah bin Abbas sends you his greetings of salam and asks you how the Messenger of Allah (peace and blessings be upon him) used to bathe and wash his head when he was in the state of ihram. I found him bathing between the two posts of a well, screening himself with a cloth. When I introduced myself and asked him the question, he drew the cloth to himself until his face and head became visible to me, and a man was standing at the well pouring water over him. Then Abu Ayyub (may Allah be pleased with him) passed both his hands over his head, moving them from front to back. Then Miswar (may Allah be pleased with him) said to Ibn Abbas (may Allah be pleased with them both): I will never argue with you again. (Ibn Jurayj did not narrate it as marfu' (attributed to the Prophet).)