24 When it was all over, Israel had killed everyone in Ai, whether in the fields or in the wilderness where they had chased them. When the killing was complete, the Israelites returned to Ai and completed the devastation.

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.