24 It happened, when Israel had made an end of killing all the inhabitants of Ai in the field, in the wilderness in which they pursued them, and they had all fallen by the edge of the sword, until they were consumed, that all Israel returned to Ai, and struck it with the edge of the sword.
Matthew Henry's Commentary on Joshua 8:24
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.