Sahih al-Bukhari 258

Muhammad ibn al-Muthanna narrated to us, saying: Abu Asim narrated to us, from Hanzalah, from al-Qasim, from Aishah, who said: When the Prophet (ﷺ) performed the full bath after sexual impurity, he called for something like a milking vessel. He took water in his palm, began with the right side of his head and then the left, and poured water over his head with both hands.