What does Judges 21:19 mean?
The leaders of Israel are committed to finding more wives for the men of the tribe of Benjamin. The other eleven tribes have killed every man, woman, and child of Benjamin other than six hundred surviving men (Judges 20:47–48). A hasty promise that they would never give daughters to Benjamin puts them in a dilemma: to keep the tribe from becoming extinct without violating their oath. One clan, from Jabesh-gilead, didn't support the war or take the oath, so wives were first acquired there (Judges 21:8–14).Since the war with Benjamin ended in excessive bloodshed, Israel's path has been marked by twisted moral logic and excuses. Here, and as explained in further verses (Judges 21:20–22), the people think of another loophole in their vow. Wives cannot be "given" to Benjaminites (Judges 21:1, 18), but they can be "taken" by Benjaminites.
The idea arises to tell the remaining Benjaminite men to lurk near an annual feast. Specific directions are given to the Benjaminites, including where to go and where suitable women will be. The plan—which seems to come from the tribal leaders (Judges 21:16)—will be for these men to lie in wait, ambushing and kidnapping women (Judges 21:20–21). After the women are "taken," their marriages will be formalized with the families so it can be said they were never "given" and the oath was not broken (Judges 21:22).