Numbers 31:17-19

New American Standard Bible

^17 (A)Now therefore, kill every male among the little ones, and kill every woman who has known a man ^[a]intimately. ¹⁸ However, all the ^[b]girls who have not known a ^[c]man intimately, keep alive for yourselves. ^19 (B)And as for you, camp outside the camp for seven days; whoever has killed a person and whoever has touched anyone killed, purify yourselves, you and your captives, on the third day and on the seventh day.