And thou shalt do to Ai and her king as thou didst to Jericho and her king,.... Burn the one and slay the other: only the spoil thereof, and the cattle thereof, shall ye take for a prey unto yourselves; which they were not allowed to do at Jericho: lay thee an ambush for the city behind it; at the west side of it: some have called in question the lawfulness of the ambush, but, as this was appointed by the Lord, there is no room for it.