³ tn The Hebrew term כּוּר (kur, “furnace,” cf. Akkadian ku„ru) is a metaphor for the intense heat of purification. A כּוּר was not a source of heat but a crucible (“iron-smelting furnace”) in which precious metals were melted down and their impurities burned away (see I. Cornelius, NIDOTTE 2:618-19). Thus Egypt served not as a place of punishment for the Israelites, but as a place of refinement to bring Israel to a place of submission to divine sovereignty.