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.'" (DE)
App reference (DE): Book 14, Hadith 15 (DE)
English reference (DE): Vol. 2, Book 14, Hadith 1379 (DE)
Arabic reference (DE): Book 14, Hadith 1389 (DE)