Judges 21:1

Now the men of Israel had sworn in Mizpeh,.... Where they were there convened, before the war began; after they had heard the account the Levite gave of the affair, which brought them thither; and after they had sent messengers to Benjamin to deliver up the men of Gibeah, that had committed the wickedness; and after they perceived that Benjamin did not hearken to their demand, but prepared to make war with them; then, as they resolved on the destruction of Gibeah, and of all the cities that sent out men against them, even all the inhabitants of them, men, women, and children, entered into an oath, that they would use those men that remained as Heathens, and not intermarry with them, as follows:

saying, there shall not any of us give his daughter unto Benjamin to wife; seeing those that used the wife of the Levite in such a base manner, and those that protected and defended them, deserved to have no wives.