Musnad Abu Ya'la al-Mawsili 108:137

On the authority of Jabir, from the Prophet (peace and blessings of Allah be upon him), he said: "Indeed, the Shaytan is present with one of you at everything, even until he is present with him at his food and his drink. So if a morsel of food falls from one of you, let him pick it up and remove whatever harm has afflicted it, then let him eat it and not leave it for the Shaytan."