The Book of Jumu'ah (Friday Prayer)
14/8. Chapter:
The Obligation Of Performing Ghusl On Friday
Sunan an-Nasai
أَخْبَرَنَا حُمَيْدُ بْنُ مَسْعَدَةَ، قَالَ حَدَّثَنَا بِشْرٌ، قَالَ حَدَّثَنَا دَاوُدُ بْنُ أَبِي هِنْدٍ، عَنْ أَبِي الزُّبَيْرِ، عَنْ جَابِرٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " عَلَى كُلِّ رَجُلٍ مُسْلِمٍ فِي كُلِّ سَبْعَةِ أَيَّامٍ غُسْلُ يَوْمٍ وَهُوَ يَوْمُ الْجُمُعَةِ " .
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.'"
Reference : Sunan an-Nasa'i 1378In-book reference : Book 14, Hadith 15English translation : Vol. 2, Book 14, Hadith 1379