Musnad Abu Ya'la al-Mawsili 109:285

Ibn Numayr narrated to us, Ya‘la narrated to us, from al-A‘mash, from Abu Sufyan, from Jabir, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "If the morsel of one of you falls, let him take it and not leave it for the Shaytan."