Judges 20:25-31
English Standard Version
Chapter 20
25And Benjamin went against them out of Gibeah the second day, and destroyed 18,000 men of the people of Israel. All these were men who drew the sword. 26Then all the people of Israel, the whole army, went up and came to Bethel and wept. They sat there before the Lord and fasted that day until evening, and offered burnt offerings and peace offerings before the Lord. 27And the people of Israel inquired of the Lord (for the ark of the covenant of God was there in those days, 28and Phinehas the son of Eleazar, son of Aaron, ministered before it in those days), saying, "Shall we go out once more to battle against our brothers, the people of Benjamin, or shall we cease?" And the Lord said, "Go up, for tomorrow I will give them into your hand."
29So Israel set men in ambush around Gibeah.
30And the people of Israel went up against the people of Benjamin on the third day and set themselves in array against Gibeah, as at other times.
31And the people of Benjamin went out against the people and were drawn away from the city. And as at other times they began to strike and kill some of the people in the highways, one of which goes up to Bethel and the other to Gibeah, and in the open country, about thirty men of Israel.