Musannaf Ibn Abi Shayba 1:529

Khalid ibn Makhlad narrated to us, he said: Sulayman ibn Bilal narrated to us, he said: Amr ibn Abi Amr narrated to me, from Hunayn ibn Abi al-Mughirah, from Abu Rafi’, who said: I saw the Prophet, peace and blessings of Allah be upon him, eat a shoulder [of meat], then he stood up for the prayer and did not touch water.