Musnad Ahmad 26:244

Abu Sa'id narrated to us, Sulayman ibn Bilal narrated to us, from 'Amr ibn Abi 'Amr, from Hamzah ibn 'Abdullah ibn 'Utbah ibn Mas'ud, from Ibn Mas'ud, who said: I saw the Messenger of Allah (peace and blessings of Allah be upon him) eat meat, then he stood for prayer, and he did not touch water.