Jami` at-Tirmidhi 104
جامع الترمذي#104SahihAishah narrated:"When AlIah's Messenger wanted to perform Ghusl for Janabah, he would begin by washing his hands before putting them into the vessel. Then he would wash his private area, and perform the Wudu (as one does) for Salat. Then he would wet his hair with the water, then he would pour water over his head with his hands three times
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 1:104