Musnad Ahmad 627:30

'Affan narrated to us, Shu'bah narrated to us, from Abu Ishaq, who said: Fear the Fire, do good, and act, for I heard 'Abdullah ibn Mu'qil saying: I heard 'Adi ibn Hatim saying: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "Fear the Fire, even if it be with half a date."