Zillah also bore Tubal-cain; he was the forger of all instruments of bronze and iron. The sister of Tubal-cain was Naamah.
We have here some particulars concerning Lamech, the seventh from Adam in the line of Cain. Observe, I. His marrying two wives. It was one of the degenerate race of Cain who first transgressed that original law of marriage that two only should be one flesh. Hitherto one man had but one wife at a time; but Lamech took two. From the beginning it was not so.
Commenting on Genesis 4:19-22
And Lamech said unto his wives, Adah and Zillah,.... Confessing what he had done, or boasting what he would do should he be attacked; or in order to make his wives easy, who might fear from his fierceness and cruelty; and the murders he had committed, or on account of Abel's murder, Gen 4:15 that either the judgments of God would fall upon him and...
Tubal-cain - The first smith on record, who taught how to make warlike instruments and domestic utensils out of brass and iron. Agricultural instruments must have been in use long before, for Cain was a tiller of the ground, and so was Adam, and they could not have cultivated the ground without spades, hooks, etc.