Sahih Bukhari
Ablutions (Wudu)
Volume: 001 / Book Number: 004 / Hadith Number: 207
Narrated Ja'far bin 'Amr bin Umaiya:
My father said, "I saw Allah's Apostle taking a piece of (cooked) mutton from the shoulder region and then he was called for prayer. He put his knife down and prayed without repeating ablution."