সহিহ বুখারী ১৯১

My aunt took me to the Prophet (ﷺ) and said, "O Allah's Messenger (ﷺ)! This son of my sister has got a disease in his legs." So he passed his hands on my head and prayed for Allah's blessings for me; then he performed ablution and I drank from the remaining water. I stood behind him and saw the seal of Prophethood between his shoulders, and it was like the "Zir-al-Hijla" (means the button of a small tent, but some said 'egg of a partridge.' etc)

My father said, "I saw `Amr bin Abi Hasan asking `Abdullah bin Zaid about the ablution of the Prophet. `Abdullah bin Zaid asked for an earthenware pot containing water and performed ablution in front of them. He poured water over his hands and washed them thrice. Then he put his (right) hand in the pot and rinsed his mouth and washed his nose by putting water in it and then blowing it out thrice with three handfuls of water Again he put his hand in the water and washed his face thrice. After that he put his hand in the pot and washed his forearms up to the elbows twice and then again put his hand in the water and passed wet hands over his head by bringing them to the front and then to the back and once more he put his hand in the pot and washed his feet (up to the ankles.)" Narrated Wuhaib: That he (the Prophet (ﷺ) in narration 191 above) had passed his wet hands on the head once only

Mahmud bin Ar-Rabi` who was the person on whose face the Prophet (ﷺ) had ejected a mouthful of water from his family's well while he was a boy, and `Urwa (on the authority of Al-Miswar and others) who testified each other, said, "Whenever the Prophet (ﷺ) , performed ablution, his companions were nearly fighting for the remains of the water