Albert Barnes Commentary Judges 21:22

"And it shall be, when their fathers or their brethren come to complain unto us, that we will say unto them, Grant them graciously unto us, because we took not for each man [of them] his wife in battle, neither did ye give them unto them, else would ye now be guilty." — Judges 21:22 (ASV)

You did not give ... - i.e., they had not broken the oath mentioned in (Judges 21:1), so as to be guilty of taking the Lord’s name in vain. They did not give their daughters to Benjamin: the Benjamites had taken them by force. Such casuistry as this condemns the system of oaths, and illustrates the wisdom of our Lord’s precept (Matthew 5:33–37).