Musnad Ahmad 32:298

Yazid narrated to us, Hammad ibn Salamah informed us, from Ubayd Allah ibn Abi Bakr, from Anas ibn Malik, that the Messenger of Allah (peace be upon him) gathered his fingers and placed them upon the ground, and said: "This is the son of Adam." Then he lifted them and placed them slightly behind that, and said: "This is his appointed term (ajal)." Then he threw his hand in front of him and said: "And there is his hope (amal)."