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 8:29
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.