Numbers 31:17-19

Revised Standard Version

¹⁷ Now therefore, kill every male among the little ones, and kill every woman who has known man by lying with him. ¹⁸ But all the young girls who have not known man by lying with him, keep alive for yourselves. ¹⁹ Encamp outside the camp seven days; whoever of you has killed any person, and whoever has touched any slain, purify yourselves and your captives on the third day and on the seventh day.