It was narrated that Jabir said:
"The Messenger of Allah (ﷺ) said: 'Every Muslim man has to perform Ghusl one day in every seven, and that is on Friday.'" (ES)
App reference (ES): Book 14, Hadith 15 (ES)
English reference (ES): Vol. 2, Book 14, Hadith 1379 (ES)
Arabic reference (ES): Book 14, Hadith 1389 (ES)