Musannaf Ibn Abi Shayba 28:163

Waki' narrated to us, he said: Sufyan narrated to us, from Simak bin Harb, from Qabisah bin Hulb, from his father, who said: I asked the Messenger of Allah, peace and blessings of Allah be upon him, about the food of the Christians. He said: "Let not food in which you have resembled a Christian cause any misgiving in your chest."