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." (ES)
App reference (ES): Book 14, Hadith 14 (ES)
English reference (ES): Vol. 2, Book 14, Hadith 1378 (ES)
Arabic reference (ES): Book 14, Hadith 1388 (ES)