Joshua 8:10 KJV

8And it shall be, when ye have taken the city, that ye shall set the city on fire: according to the commandment of the LORD shall ye do. See, I have commanded you.

9Joshua therefore sent them forth: and they went to lie in ambush, and abode between Bethel and Ai, on the west side of Ai: but Joshua lodged that night among the people.

10And Joshua rose up early in the morning, and numbered the people, and went up, he and the elders of Israel, before the people to Ai.

11And all the people, even the people of war that were with him, went up, and drew nigh, and came before the city, and pitched on the north side of Ai: now there was a valley between them and Ai.

12And he took about five thousand men, and set them to lie in ambush between Bethel and Ai, on the west side of the city.