Musnad Abu Ya'la al-Mawsili 107:10

Harun narrated to us, Abdullah bin Wahb narrated to us, Amr bin al-Harith informed me, from Abu Ali Thumamah bin Shafi, that he heard Uqbah bin Amir saying: I heard the Messenger of Allah, may Allah bless him and grant him peace, while he was on the pulpit, saying: "And prepare against them whatever you are able of power" (Al-Anfal: 60). Beware, indeed the power is archery. Beware, indeed the power is archery. Beware, indeed the power is archery.