Joshua 8:24-26

24When Israel had finished killing everyone living in Ai who had pursued them into the open country, and when every last one of them had fallen by the sword, all Israel returned to Ai and struck it down with the sword.

25The total of those who fell that day, both men and women, was twelve thousand — all the people of Ai.

26Joshua did not draw back his hand that was holding the javelin until all the inhabitants of Ai were completely destroyed.