29 And the king of Ai he hanged on a tree until the evening; and at the going down of the sun Joshua commanded, and they took his carcase down from the tree, and threw it down at the entrance of the gate of the city, and raised upon it a great heap of stones, [which remains] 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.