It was narrated that Jubair bin Mut'im said: "They argued about Ghusl in the presence of the messenger of Allah (ﷺ). One of the people said: “I perform Ghusl in such-and-such a manner.' The Messenger of Allah (ﷺ) said: “As for me, I pour three handfuls of water over my head””"
SahihSahihSahih - Agreed UponBook 1 · Hadith 251