Then he washed his feet.¹

This is a good and authentic hadith.

On this topic there are also reports from Umm Salamah, Jabir, Abu Sa'id, Jubayr ibn Mut'im, and Abu Hurayrah.

104 — Ibn Abi 'Umar narrated to us, saying: Sufyan ibn 'Uyaynah narrated to us, from Hisham ibn 'Urwah, from his father, from 'A'ishah, who said: When the Messenger of Allah, peace and blessings be upon him, wanted to perform the major ablution (ghusl) from ritual impurity (janabah), he would begin by washing his hands before putting them into the vessel, then he would wash his private parts, and perform the ablution (wudu') as he did for prayer. Then he would let water reach through his hair, then he would scoop three handfuls of water over his head.²

This is a good and authentic hadith.

This is what the scholars of knowledge have chosen regarding the major ablution from ritual impurity: that one performs the ablution (wudu') as for prayer, then pours water over one's head three times, then lets the water flow over the rest of the body.

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¹ Authentic. Narrated by al-Bukhari (249) and (257), Muslim (317), Abu Dawud (245), Ibn Majah (467) and (573), al-Nasa'i 1/137, 200, 204, and 208. It is in al-Musnad (26798) and Sahih Ibn Hibban (1190).

² Authentic. Narrated by al-Bukhari (248) and (272), Muslim (316), Abu Dawud (242), al-Nasa'i 1/132, 133, 134, 135, 205, and 206. It is in al-Musnad (24257) and Sahih Ibn Hibban (1196).

"Al-hathyah" (handful): a scoop taken with the hand.