Judges 21:12

They brought them into the camp If the vow they had made would admit of their sparing the virgins, why could they not also, in consistency with that oath, have spared the other women and children, and innocent persons, and only punished the guilty? But it is evident “that convenience, rather than justice or piety, induced them to spare the virgins, that they might extricate themselves from the difficulties in which their rash oath had involved them.” Scott.