Narrated Abu Said Al-Khudri (Radi-Allahu ‘anhu):
The Prophet (Sallallahu ‘Alaihi Wa Sallam) said, “Ghusl (taking a bath) on
Friday is compulsory for every Muslim reaching the age of puberty.”
Bukhari Vol. 1 : No. 817
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Its a general thinking that ghusl on friday is a sunnah, but the hadith states otherwise??
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It is an issue of dispute. The most authentic opinion is that it is Sunnah.