Sahih al-Bukhari, Hadith 919 ⓘ
Narrated Salim: My father said, "I heard the Prophet delivering the Khutba on the pulpit and he said, 'Whoever comes for the Jumua prayer should take a bath (before coming).' "
حَدَّثَنَا آدَمُ، قَالَ حَدَّثَنَا ابْنُ أَبِي ذِئْبٍ، عَنِ الزُّهْرِيِّ، عَنْ سَالِمٍ، عَنْ أَبِيهِ، قَالَ سَمِعْتُ النَّبِيَّ صلى الله عليه وسلم يَخْطُبُ عَلَى الْمِنْبَرِ فَقَالَ " مَنْ جَاءَ إِلَى الْجُمُعَةِ فَلْيَغْتَسِلْ " .
also referenced under: Book 11, Hadith 43 (In-Book) & Volume 2, Book 13, Hadith 42 (USC-MSA)