Tubal-Cain is the first-mentioned worker in iron ( Genesis 4:22 ). The Egyptians wrought it at Sinai before the Exodus. David prepared it in great abundance for the temple ( 1 Chronicles 22:3 : 29:7 ). The merchants of Dan and Javan brought it to the market of Tyre ( Ezekiel 27:19 ). Various instruments are mentioned as made of iron ( Deuteronomy 27:5 ; 19:5 ; Joshua 17:16,18 ; 1 Samuel 17:7 ; 2 Samuel 12:31 ; 2 Kings 6:5,6 ; 1 Chronicles 22:3 ; Isaiah 10:34 ). Figuratively, a yoke of iron ( Deuteronomy 28:48 ) denotes hard service; a rod of iron ( Psalm 2:9 ), a stern government; a pillar of iron ( Jeremiah 1:18 ), a strong support; a furnace of iron ( Deuteronomy 4:20 ), severe labour; a bar of iron ( Job 40:18 ), strength; fetters of iron ( Psalm 107:10 ), affliction; giving silver for iron ( Isaiah 60:17 ), prosperity.
Source
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source-manifest/easton— Easton's Bible Dictionary (PD)