There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bare children to them, the same became mighty men which were of old, men of {f} renown.

(f) Who usurped authority over others, and degenerated from that simplicity, in which their father's lived.

Wesley's Notes

6:4 There were giants, and men of renown - They carried all before them,
1. With their great bulk, as the sons of Anak, Nu 13:33, and,
2. With their great name, as the king of Assyria, Isa 37:11. Thus armed, they daringly insulted the rights of all their neighbours, and trampled upon all that is just and sacred.

Scofield Reference Notes

[1] sons of God

Some hold that these "sons of God" were the "angels which kept not their first estate" Jude 1:6. It is asserted that the title is in the O.T. exclusively used of angels. But this is an error Isa 43:6. Angels are spoken of in a sexless way. No female angels are mentioned in Scripture, and we are expressly told that marriage is unknown among angels. Mt 22:30.

The uniform Hebrew and Christian interpretation has been that verse Gen 6:2 marks the breaking down of the separation between the godly line of Seth and the godless line of Cain, and Song the failure of the testimony to Jehovah committed to the line of Seth Gen 4:26. For apostasy there is no remedy but judgment Isa 1:2-7,24,25 Heb 6:4-8 10:26-31. Noah, "a preacher of righteousness," is given 120 years, but he won no convert, and the judgment predicted by his great-grandfather fell Jude 1:14,15 Gen 7:11.

Jamieson-Fausset-Brown Bible Commentary

4. giants-The term in Hebrew implies not so much the idea of great stature as of reckless ferocity, impious and daring characters, who spread devastation and carnage far and wide.

Matthew Henry's Concise Commentary

6:1-7 The most remarkable thing concerning the old world, is the destroying of it by the deluge, or flood. We are told of the abounding iniquity of that wicked world: God's just wrath, and his holy resolution to punish it. In all ages there has been a peculiar curse of God upon marriages between professors of true religion and its avowed enemies. The evil example of the ungodly party corrupts or greatly hurts the other. Family religion is put an end to, and the children are trained up according to the worldly maxims of that parent who is without the fear of God. If we profess to be the sons and daughters of the Lord Almighty, we must not marry without his consent. He will never give his blessing, if we prefer beauty, wit, wealth, or worldly honours, to faith and holiness. The Spirit of God strove with men, by sending Enoch, Noah, and perhaps others, to preach to them; by waiting to be gracious, notwithstanding their rebellions; and by exciting alarm and convictions in their consciences. But the Lord declared that his Spirit should not thus strive with men always; he would leave them to be hardened in sin, and ripened for destruction. This he determined on, because man was flesh: not only frail and feeble, but carnal and depraved; having misused the noble powers of his soul to gratify his corrupt inclinations. God sees all the wickedness that is among the children of men; it cannot be hid from him now; and if it be not repented of, it shall be made known by him shortly. The wickedness of a people is great indeed, when noted sinners are men renowned among them. Very much sin was committed in all places, by all sorts of people. Any one might see that the wickedness of man was great: but God saw that every imagination, or purpose, of the thoughts of man's heart, was only evil continually. This was the bitter root, the corrupt spring. The heart was deceitful and desperately wicked; the principles were corrupt; the habits and dispositions evil. Their designs and devices were wicked. They did evil deliberately, contriving how to do mischief. There was no good among them. God saw man's wickedness as one injured and wronged by it. He saw it as a tender father sees the folly and stubbornness of a rebellious and disobedient child, which grieves him, and makes him wish he had been childless. The words here used are remarkable; they are used after the manner of men, and do not mean that God can change, or be unhappy. Does God thus hate our sin? And shall not we be grieved to the heart for it? Oh that we may look on Him whom we have grieved, and mourn! God repented that he had made man; but we never find him repent that he redeemed man. God resolves to destroy man: the original word is very striking, 'I will wipe off man from the earth,' as dirt or filth is wiped off from a place which should be clean, and is thrown to the dunghill, the proper place for it. God speaks of man as his own creature, when he resolves upon his punishment. Those forfeit their lives who do not answer the end of their living. God speaks of resolution concerning men, after his Spirit had been long striving with them in vain. None are punished by the justice of God, but those who hate to be reformed by the grace of God.