Musnad Abu Ya'la al-Mawsili 151:98

Suwayd ibn Sa'id and 'Abd al-Ghaffar ibn 'Abd Allah narrated to us, they said: 'Ali ibn Mushir narrated to us, from al-A'mash, from Ibrahim al-Nakha'i, from 'Alqamah, from Ibn Mas'ud, who said: When this verse was revealed: "There is no blame upon those who believe and do righteous deeds for what they have eaten if they fear [Allah] and believe and do righteous deeds..." to the end of the verse (al-Ma'idah), the Messenger of Allah (peace be upon him) said: "It was said to me: 'You are among them.'" This is the wording of 'Abd al-Ghaffar.