Judges 21:2

And the people came to the house of God, and abode there till even before God, and lifted up their voices, and wept sore;

The people ... lifted up their voices, and wept. The characteristic fickleness of the Israelites was not long in being displayed; because scarcely had they cooled from the fierceness of their sanguinary vengeance than they began to relent, and rushed to the opposite extreme of self-accusation and grief at the desolation which their impetuous zeal had produced. Their victory saddened and humbled them. Their feelings on the occasion were expressed by a public and solemn service of expiation at the house of God. And yet this extraordinary observance, though it enabled them to find vent for their painful emotions, did not afford them full relief; because they were fettered by the obligation of a religious vow, heightened by the addition of a solemn anathema on every violator of the oath. There is no previous record of this oath; but the purport of it was, that they would treat the perpetrators of this Gibeah atrocity in the same way as the Canaanites, who were doomed to destruction; and the entering into this solemn league was of a piece with the rest of their inconsiderate conduct in this whole affair.