Numbers 31:17-19

Holman Christian Standard Bible

¹⁷ So now, kill all the male children and kill every woman who has had sexual relations with a man, ¹⁸ but keep alive for yourselves all the young females who have not had sexual relations.

¹⁹ “You are to remain outside the camp for seven days. All of you and your prisoners who have killed a person or touched the dead are to purify yourselves on the third day and the seventh day.