وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ سَعِيدِ بْنِ أَبِي سَعِيدٍ الْمَقْبُرِيِّ، عَنْ أَبِي هُرَيْرَةَ، أَنَّهُ كَانَ يَقُولُ غُسْلُ يَوْمِ الْجُمُعَةِ وَاجِبٌ عَلَى كُلِّ مُحْتَلِمٍ كَغُسْلِ الْجَنَابَةِ ‏.‏

Yahya related to me from Malik from Said ibn Abi Said al-Maqburithat Abu Hurayra used to say, "Doing ghusl as prescribed for majorritual impurity is incumbent (wajib) on the day of jumua on every malewho has reached puberty." Translation Not Available

Book Ref: Muwatta Imam Malik Book 5 Hadith 227
Web Ref:  Muwatta Imam Malik Book 5 Hadith 2