Judges 21:6

And the children of Israel repented them for Benjamin their brother, and said, There is one tribe cut off from Israel this day.

Cross-reference

Judges 21:15 repeats the same repentance for Benjamin, emphasizing the grief over the lost tribe.

Judges 20:23 records Israel weeping before battle, while Judges 21:6 weeps after—both show emotional response to the Benjamin crisis.