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