At that time Joshua turned back and captured Hazor and put its king to the sword. (Hazor had been the head of all these kingdoms.)
References for Joshua 11:10
Everyone in it they put to the sword. They totally destroyed them, not sparing anyone that breathed, and he burned Hazor itself.
References for Joshua 11:11
Joshua took all these royal cities and their kings and put them to the sword. He totally destroyed them, as Moses the servant of the LORD had commanded.
References for Joshua 11:12
Yet Israel did not burn any of the cities built on their mounds—except Hazor, which Joshua burned.
The Israelites carried off for themselves all the plunder and livestock of these cities, but all the people they put to the sword until they completely destroyed them, not sparing anyone that breathed.
References for Joshua 11:14