Musnad Ahmad 524:6

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from al-Zuhri, from Ibn 'Amr ibn Umayyah al-Damri, from his father: That he saw the Messenger of Allah (peace and blessings of Allah be upon him) cutting from a shoulder [of meat], and he ate. Then the mu'adhdhin came to him, so he threw down the knife, then he stood for the prayer, and he did not perform wudu.