وَحَدَّثَنِي 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 ‏"‏ ‏.‏

Yahya related to me from Malik from Safwan ibn Sulaym from Ataibn Yasar from Abu Said al-Khudri that the Messenger of Allah, mayAllah bless him and grant him peace, said, "Ghusl on the day of jumuais incumbent on every male who has reached puberty." Translation Not Available

Book Ref: Muwatta Imam Malik Book 5 Hadith 229
Web Ref:  Muwatta Imam Malik Book 5 Hadith 4