Sunan an-Nasa'i 420
سنن النسائي#420SahihIt was narrated that 'Aishah said:"When the Messenger of Allah (ﷺ) performed Ghusl from Janabah, he would wash his hands, then perform Wudu' as for prayer, then he would perform Ghusl, then run his fingers through his hair to be sure that the water pour water over his head three times, then wash the rest of his body
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 4:25