Numbers 31:19-21

New King James Version

¹⁹ And as for you, ^(A)remain outside the camp seven days; whoever has killed any person, and ^(B)whoever has touched any slain, purify yourselves and your captives on the third day and on the seventh day. ²⁰ Purify every garment, everything made of leather, everything woven of goats’ hair, and everything made of wood.”

²¹ Then Eleazar the priest said to the men of war who had gone to the battle, “This is the ^[a]ordinance of the law which the Lord commanded Moses: