Musnad Abu Ya'la al-Mawsili 107:9

Harun ibn Ma'ruf narrated to us, Abdullah ibn Wahb narrated to us, Amr ibn al-Harith informed me, from Abu Ali, from Uqbah ibn Amir, that he said: I heard the Messenger of Allah (peace and blessings of Allah be upon him) say: "Lands will be opened for you, and Allah will suffice you. So let not one of you be incapable of amusing himself with his arrows."