Sahih al-Bukhari 895
صحيح البخاري#895SahihNarrated Abu Sa`id Al-Khudri:Allah's Messenger (ﷺ) said, "The taking of a bath on Friday is compulsory for every Muslim who has attained the age of puberty
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 11:20