Numbers 31:17-19

Complete Jewish Bible

¹⁷ Now kill every male among the little ones, and kill every woman who has ever slept with a man. ¹⁸ But the young girls who have never slept with a man, keep alive for yourselves. ¹⁹ Pitch your tents outside the camp for seven days. Whoever has killed a person or touched the corpse of someone slain, purify yourselves on the third and seventh days, you and your captives.