Encyclopedia of Prophetic Hadiths

The Prophet (may Allah's peace and blessings be upon him) used to take a ritual bath with one Sā‘ up to five Mudds, and he used to perform ablution with one Mudd.

The Prophet (may Allah’s peace and blessings be upon him) performed ablution by washing the body parts twice.

I witnessed 'Amr ibn Abi Hasan asking 'Abdullah ibn Zayd about the ablution of the Prophet (may Allah's peace and blessings be upon him), so he asked for a vessel of water and performed ablution like that of the Prophet (may Allah's peace and blessings be upon him) in front of them. He poured water from the vessel on his hand, washing his hands thrice. Then, he put his hand inside the vessel, rinsed his mouth, sniffed water, and blew it out with three handfuls. He put his hand in the water again and washed his face thrice. Then, he washed his hands twice up to the elbows, after which he put his hand in the water and wiped over his head, bringing them to the front and the back of his head once. Then, he washed his feet up to the ankles.