Numbers 31:15-18

15“Why did you let all the women live?” he asked them.

16“Remember, they were the ones who followed Balaam’s advice and caused the Israelites to be unfaithful to the Lord in the incident that took place at Peor. The Lord’s community experienced a plague at that time.

17So kill all the Midianite boys and every Midianite woman who has gone to bed with a man.

18But save for yourselves every girl who has never gone to bed with a man.