Adam Clarke on Judges 1:24

Show us - the entrance into the city - Taken in whatever light we choose, the conduct of this man was execrable. He was a traitor to his country, and he was accessary to the destruction of the lives and property of his fellow citizens, which he most sinfully betrayed, in order to save his own. According to the rules and laws of war, the children of Judah might avail themselves of such men and their information; but this does not lessen, on the side of this traitor, the turpitude of the action.