Bamidbar 31:21-23

Orthodox Jewish Bible

²¹ And Eleazar HaKohen said unto the anshei hatzavah which went into milchamah, This is the chukkat hatorah which Hashem commanded Moshe:

²² Only the zahav, and the kesef, the nechoshet, the barzel, the bedil, and the oferet,

²³ Everything that can withstand eish, ye shall make it go through the eish, and it shall be tahor; nevertheless it shall be purified with the mayim of niddah; and all that can not withstand the eish ye shall make go through the mayim.