Musnad Ahmad 33:112

Waki’ narrated to us, from Sufyan, and (in another chain) ‘Abd al-Razzaq said: Sufyan informed us, from Abu al-Zubayr, from Jabir, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "If the morsel of one of you falls, let him remove whatever is upon it of harm, and let him eat it, and let him not leave it for the Shaytan."