It was narrated from Abu Sa'eed Al-Khudri that:
The Messenger of Allah (ﷺ) said: "Ghusl on Friday is obligatory for everyone who has reached the age of puberty."
App reference: Book 14, Hadith 14
English reference: Vol. 2, Book 14, Hadith 1378
Arabic reference: Book 14, Hadith 1388