Sunan an-Nasai 16118
In-book no 1382أَخْبَرَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، عَنْ صَفْوَانَ بْنِ سُلَيْمٍ، عَنْ عَطَاءِ بْنِ يَسَارٍ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " غُسْلُ يَوْمِ الْجُمُعَةِ وَاجِبٌ عَلَى كُلِّ مُحْتَلِمٍ " .
It was narrated from Abu Sa'eed Al-Khudri that: The Messenger of Allah (ﷺ) said: "Ghusl on Friday is obligatory for everyone who has reached the age of puberty."