Read Judges 21:18 Using Other Translations
Howbeit we may not give them wives of our daughters: for the children of Israel have sworn, saying, Cursed be he that giveth a wife to Benjamin.
Yet we cannot give them wives from our daughters."For the people of Israel had sworn, "Cursed be he who gives a wife to Benjamin."
But we cannot give them our own daughters in marriage because we have sworn with a solemn oath that anyone who does this will fall under God’s curse.”