Sahih al-Bukhari 919
Sahih al-Bukhari · Book 11: Friday Prayer · (To deliver) the Khutba on the pulpit
Narrated Salim:
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 " .
My father said , "I heard the Prophet (ﷺ) delivering the Khutba on the pulpit and he said, 'Whoever comes for the Jumua prayer should take a bath (before coming).' "