Abu Dawud
Purification (Kitab Al-Taharah)
Book Number: 001 / Hadith Number: 340
Narated By Abu Hurairah : While 'Umar al-Kahttab was making a speech on Friday (in the mosque), a man came in. 'Umar said: Are you detained from prayer? The man said: As soon as I heard the call of prayer, I performed ablution. Then 'Umar said: Only ablution? Did you not hear the Apostle of Allah (pbuh) say: When any one of you comes for Friday (prayer) he should take a bath.