Musnad Ahmad 25:1604

'Abd al-Razzaq and Ibn Bakr narrated to us, they said: Ibn Jurayj informed us, he said: 'Umar ibn 'Ata' ibn Abi al-Khuwar informed me that he heard Ibn 'Abbas saying: "While the Messenger of Allah (peace and blessings of Allah be upon him) was eating a piece of meat with bone (an 'arq), the mu'adhdhin came to him, so he put it down and stood up for the prayer, and he did not touch water."