23 But the king of Ai they made prisoner, and took him to Joshua. 24 Then, after the destruction of all the people of Ai in the field and in the waste land where they went after them, and when all the people had been put to death without mercy, all Israel went back to Ai, and put to death all who were in it without mercy. 25 On that day twelve thousand were put to death, men and women, all the people of Ai. 26 For Joshua did not take back his hand with the outstretched spear till the destruction of the people of Ai was complete. 27 But the cattle and the goods from that town, Israel took for themselves, as the Lord had given orders to Joshua. 28 So Joshua gave Ai to the flames, and made it a waste mass of stones for ever, as it is to this day. 29 And he put the king of Ai to death, hanging him on a tree till evening: and when the sun went down, Joshua gave them orders to take his body down from the tree, and put it in the public place of the town, covering it with a great mass of stones, which is there to this day.

Matthew Henry's Commentary on Joshua 8:23-29

Commentary on Joshua 8:23-29

(Read Joshua 8:23-29)

God, the righteous Judge, had sentenced the Canaanites for their wickedness; the Israelites only executed his doom. None of their conduct can be drawn into an example for others. Especial reason no doubt there was for this severity to the king of Ai; it is likely he had been notoriously wicked and vile, and a blasphemer of the God of Israel.