Miswar and Ibn Abbas disagreed, and on one occasion he said they disputed about whether a person in the state of ihram could pour water over his head.So they sent a messenger to Abu Ayub asking, "How did you see the Messenger of Allah ﷺ wash his head?"He replied, "Like this," moving his hands forward and backward. Sufyan demonstrated it.
حدثنا سفيان عن زيد بن أسلم
اختلف المسور وابن عباس وقال مرة امترى في المحرم يصب على رأسه الماء قال فأرسلوا إلى أبي أيوب كيف رأيت رسول الله ﷺ يغسل رأسه فقال هكذا مقبلا ومدبرا وصفه سفيان
Its isnad is sahih. Ibrahim bin Abdullah bin Hunain is trustworthy, as is his father, and their hadith is found in the collections of the Jamaah. The hadith was narrated by Bukhari, 3/20, Shab edition, in the chapter on the one prevented from completing the pilgrimage, on bathing for the one in the state of Muharram, and by Abu Dawud, 2/168, number 1840, in the chapter on the rites of pilgrimage, similarly.