Musannaf Ibn Abi Shayba 16:228

Abu Bakr narrated to us, he said: Ibn Fudayl narrated to us, from al-A'mash, from Abu Sufyan, from Jabir, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "If a morsel of food falls from the hand of one of you, let him wipe away whatever harm is upon it, and let him eat it."