Judges 21:5-7 New International Version - UK (NIVUK)
5 Then the Israelites asked, ‘Who from all the tribes of Israel has failed to assemble before the Lord?’ For they had taken a solemn oath that anyone who failed to assemble before the Lord at Mizpah was to be put to death.
6 Now the Israelites grieved for the tribe of Benjamin, their fellow Israelites. ‘Today one tribe is cut off from Israel,’ they said. 7 ‘How can we provide wives for those who are left, since we have taken an oath by the Lord not to give them any of our daughters in marriage?’