Joshua 8:25-29

So all who fell that day, both men and women, were twelve thousand—all the people of Ai.

For Joshua did not withdraw his hand with which he reached out with the sword until he had utterly destroyed all the inhabitants of Ai.

Israel took only the cattle and the spoils of that city as plunder for themselves, in accordance with the word of the Lord which He had commanded Joshua.

So Joshua burned Ai and made it a refuse heap forever, a desolation until this day.

And he hanged the king of Ai on a tree until evening; but at sunset Joshua gave the command and they took his body down from the tree and threw it at the entrance of the city gate, and erected over it a large heap of stones that stands to this day.