Judges 21:4-6

4It came about the next day that the people arose early and built 1an altar there and offered burnt offerings and peace offerings.

5Then the sons of Israel said, “Who is there among all the tribes of Israel who did not come up in the assembly to the Lord?” For 2they had taken a great oath concerning him 3who did not come up to the Lord at Mizpah, saying, “He shall surely be put to death.” 6And the sons of Israel were sorry for their brother Benjamin and said, “One tribe is cut off from Israel today.