Numbers 31:21 YLT

¹⁹  'And ye, encamp ye at the outside of the camp seven days -- any who hath slain a person, and any who hath come against a pierced one, ye cleanse yourselves on the third day, and on the seventh day -- ye and your captives;

²⁰  and every garment, and every skin vessel, and every work of goats' 'hair', and every wooden vessel, ye yourselves cleanse.'

²¹  And Eleazar the priest saith unto the men of the host who go in to battle, 'This 'is' the statute of the law which Jehovah hath commanded Moses:

²²  only, the gold, and the silver, the brass, the iron, the tin, and the lead,

²³  every thing which may go into fire, ye cause to pass over through fire, and it hath been clean; only, with the water of separation it is cleansed, and all that may not go into fire, ye cause to pass over through water;