Numbers 31:18-20

American Standard Version

¹⁸ But all the women-children, that have not known man by lying with him, keep alive for yourselves. ¹⁹ And encamp ye without the camp seven days: whosoever hath killed any person, and whosoever hath touched any slain, purify yourselves on the third day and on the seventh day, ye and your captives. ²⁰ And as to every garment, and all that is made of skin, and all work of goats’ hair, and all things made of wood, ye shall purify yourselves.