Judges 1:25

‘ And he showed them the way in to the city, and they smote the city with the edge of the sword, but they let the man go and all his family.'

“And he showed them the way in to the city.” He betrayed his fellow Canaanites and showed them a means by which they could enter the city.

“And they smote the city with the edge of the sword, but they let the man go and all his family.” The men of Joseph broke into the city and slaughtered its inhabitants. However, like Rahab before him, the man, by his action, saved his family. His departure was presumably a condition of the deal, or possibly his conscience was such that he could no longer stay near the place where he had betrayed his comrades. Either way it meant that the men of Joseph had fully obeyed Yahweh. They had either slain or driven out all the inhabitants.