Joshua 8:27-29

27But Israel did carry off for themselves the livestock and plunder of this city, as the Lord had instructed Joshua. 28So Joshua burned Ai and made it a permanent heap of ruins, a desolate place to this day. 29He impaled the body of the king of Ai on a pole and left it there until evening. At sunset, Joshua ordered them to take the body from the pole and throw it down at the entrance of the city gate. And they raised a large pile of rocks over it, which remains to this day.