And Lamech took unto him {q} two wives: the name of the one was Adah, and the name of the other Zillah.

(q) The lawful institution of marriage, which is, that two should be one flesh, was first corrupted in the house of Cain by Lamech.

Wesley's Notes

4:19 And Lamech took 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. Jabal was a famous shepherd; he delighted much in keeping cattle, and was so happy in devising methods of doing it to the best advantage, and instructing others in them, that the shepherds of those times, nay, the shepherds of after - times, called him Father; or perhaps his children after him, being brought up to the same employment: the family was a family of shepherds. Jubal was a famous musician, and particularly an organist, and the first that gave rules for that noble art or science of music. When Jabal had set them in a way to be rich, Jubal put them in a way to be merry. From Jubal probably the Jubilee trumpet was so called; for the best music was that which proclaimed liberty and redemption.

Jamieson-Fausset-Brown Bible Commentary

19. Lamech took unto him two wives-This is the first transgression of the law of marriage on record, and the practice of polygamy, like all other breaches of God's institutions, has been a fruitful source of corruption and misery.

Matthew Henry's Concise Commentary

4:19-24 One of Cain's wicked race is the first recorded, as having broken the law of marriage. Hitherto, one man had but one wife at a time; but Lamech took two. Wordly things, are the only things that carnal, wicked people set their hearts upon, and are most clever and industrious about. So it was with this race of Cain. Here was a father of shepherds, and a father of musicians, but not a father of the faithful. Here is one to teach about brass and iron, but none to teach the good knowledge of the Lord: here are devices how to be rich, and how to be mighty, and how to be merry; but nothing of God, of his fear and service. Present things fill the heads of most. Lamech had enemies, whom he had provoked. He draws a comparison betwixt himself and his ancestor Cain; and flatters himself that he is much less criminal. He seems to abuse the patience of God in sparing Cain, into an encouragement to expect that he may sin unpunished.