Numbers 31:19-24

19And 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. 20And purify all your raiment, and all that is made of skins, and all work of goats’ hair, and all things made of wood.1

21And Eleazar the priest said unto the men of war which went to the battle, This is the ordinance of the law which Yhwh commanded Moses; 22Only the gold, and the silver, the brass, the iron, the tin, and the lead, 23Every thing that may abide the fire, ye shall make it go through the fire, and it shall be clean: nevertheless it shall be purified with the water of separation: and all that abideth not the fire ye shall make go through the water. 24And ye shall wash your clothes on the seventh day, and ye shall be clean, and afterward ye shall come into the camp.