XXbel-oz, bel-us: The word occurs once only in English Versions of the Bible, in Jer 6:29, where the prophet is predicting the coming of the destroyer (verse 26), "a great nation" from "the north country" (verse 22), down upon Israel, because "all of them deal corruptly" (verse 28). "The bellows blow fiercely; the leads is of the fire." Here the imagery is drawn from the refiners art, and the "bellows" are those used to make the refiners fires burn fiercely.
See CRAFTS, II, 10.