Sahih al-Bukhari 877
Book 11: Friday Prayer · Narrated by `Abdullah bin `Umar
Arabic
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، قَالَ أَخْبَرَنَا مَالِكٌ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ ـ رضى الله عنهما ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " إِذَا جَاءَ أَحَدُكُمُ الْجُمُعَةَ فَلْيَغْتَسِلْ ".
English translation
Narrated `Abdullah bin `Umar:Allah's Messenger (ﷺ) said, "Anyone of you attending the Friday (prayers) should take a bath
Reference: Sahih al-Bukhari 877, Book of Friday Prayer. English translation by Dr. Muhammad Muhsin Khan.