Numbers 31:17-19

Living Bible

¹⁷ Now kill all the boys and all the women who have had sexual intercourse. ¹⁸ Only the little girls may live; you may keep them for yourselves. ¹⁹ Now stay outside of the camp for seven days, all of you who have killed anyone or touched a dead body. Then purify yourselves and your captives on the third and seventh days.