Sahih Bukhari Volume 2, Book 11, Hadith 883

حَدَّثَنَا أَبُو نُعَيْمٍ، قَالَ حَدَّثَنَا شَيْبَانُ، عَنْ يَحْيَى، عَنْ أَبِي سَلَمَةَ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ عُمَرَ ـ رضى الله عنه ـ بَيْنَمَا هُوَ يَخْطُبُ يَوْمَ الْجُمُعَةِ إِذْ دَخَلَ رَجُلٌ فَقَالَ عُمَرُ لِمَ تَحْتَبِسُونَ عَنِ الصَّلاَةِ فَقَالَ الرَّجُلُ مَا هُوَ إِلاَّ سَمِعْتُ النِّدَاءَ تَوَضَّأْتُ‏.‏ فَقَالَ أَلَمْ تَسْمَعُوا النَّبِيَّ صلى الله عليه وسلم قَالَ ‏"‏ إِذَا رَاحَ أَحَدُكُمْ إِلَى الْجُمُعَةِ فَلْيَغْتَسِلْ ‏"‏‏

Narrated By 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'?".