(5) باب
Narrated Abu Huraira:
While `Umar (bin Al-Khattab) was delivering the Khutba on a Friday, a man entered (the mosque). `Umar asked him, "What has detained you from the prayer?" The man said, "It was only that when I heard the Adhan I performed ablution (for the prayer)." On that `Umar said, "Did you not hear the Prophet saying: 'Anyone of you going out for the Jumua prayer should take a bath'?".
Reference: Sahih al-Bukhari 882
In-book reference: Book 11, Hadith 7
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 13, Hadith 7