Cross reference
Judges 21:18
18 Seeing that we may not give them our daughters as wives? For the children of Israel had taken an oath, saying, Cursed is he who gives a wife to Benjamin.
Judges 21:1
1 Now the men of Israel had taken an oath in Mizpah, saying, Not one of us will give his daughter as a wife to Benjamin.
Judges 11:35
35 And when he saw her he was overcome with grief, and said, Ah! my daughter! I am crushed with sorrow, and it is you who are the chief cause of my trouble; for I have made an oath to the Lord and I may not take it back.