18 Then the Lord said to Joshua, "Hold out toward Ai the javelin that is in your hand, for into your hand I will deliver the city." So Joshua held out toward the city the javelin that was in his hand.

Matthew Henry's Commentary on Joshua 8:18

Commentary on Joshua 8:3-22

(Read Joshua 8:3-22)

Observe Joshua's conduct and prudence. Those that would maintain their spiritual conflicts must not love their ease. Probably he went into the valley alone, to pray to God for a blessing, and he did not seek in vain. He never drew back till the work was done. Those that have stretched out their hands against their spiritual enemies, must never draw them back.