Numbers 31:17-19

Authorized (King James) Version

¹⁷ Now therefore kill every male among the little ones, and kill every woman that hath known man by lying with him. ¹⁸ But all the women children, that have not known a man by lying with him, keep alive for yourselves. ¹⁹ And do ye abide without the camp seven days: whosoever hath killed any person, and whosoever hath touched any slain, purify both yourselves and your captives on the third day, and on the seventh day.