Musnad Ahmad 26:243

Qutaybah ibn Sa'id narrated to us, 'Abd al-'Aziz ibn Muhammad narrated to us, from 'Amr—meaning Ibn Abi 'Amr—from 'Ubayd Allah ibn 'Abd Allah 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) eating meat, then he would stand for prayer, and he would not touch a drop of water.