Judges 21:1-7

Now the men of Israel had sworn [an oath] at Mizpah, “None of us shall give his daughter in marriage to [a man of] Benjamin.” So the people came to Bethel and sat there before God until evening, and lifted up their voices and wept bitterly. [Judg 20:27] They said, “O LORD, God of Israel, why has this come about in Israel, that there should be today one tribe missing from Israel?” And the next day the people got up early and built an altar there and offered burnt offerings and peace offerings. Then the sons of Israel said, “Which one from all the tribes of Israel did not come up in the assembly to the LORD?” For they had taken a great oath concerning him who did not come up to the LORD at Mizpah, saying, “He shall certainly be put to death.” And the sons of Israel felt sorry [and had compassion] for their brother Benjamin and said, “One tribe has been cut off from Israel today. What shall we do for wives for those who are left, since we have sworn [an oath] by the LORD that we will not give them any of our daughters as wives?”