Josephus Antiquities of the Jews Book 1 3:1

1 Now this posterity of Seth continued to esteem God as the Lord of the universe, and to have an entire regard to virtue, for seven generations: but in process of time they were perverted, and forsook the practices of their fore-fathers; and did neither pay those honours to God which were appointed them, nor had they any concern to do justice towards men. But for what degree of zeal they had formerly shewn for virtue, they now shewed by their actions a double degree of wickedness. Whereby they made God to be their enemy. For many Angels of God accompanied with women, and begat sons that proved unjust, and despisers of all that was good; on account of the confidence they had in their own strength. For the tradition is, that these men did what resembled the acts of those whom the Grecians call Giants. But Noah was very uneasy at what they did: and being displeased at their conduct, persuaded them to change their dispositions, and their actions for the better. But seeing they did not yield to him, but were slaves to their wicked pleasures, he was afraid they would kill him, together with his wife and children, and those they had married. So he departed out of that land.

New Testament

2 Peter 2:5

1 But false prophets arose among the people, just as there will be false teachers among you. These false teachers will infiltrate your midst with destructive heresies, even to the point of denying the Master who bought them. As a result, they will bring swift destruction on themselves. 2 And many will follow their debauched lifestyles. Because of these false teachers, the way of truth will be slandered. 3 And in their greed they will exploit you with deceptive words. Their condemnation pronounced long ago is not sitting idly by; their destruction is not asleep. 4 For if God did not spare the angels who sinned, but threw them into hell and locked them up in chains in utter darkness, to be kept until the judgment, 5 and if he did not spare the ancient world, but did protect Noah, a herald of righteousness, along with seven others, when God brought a flood on an ungodly world, 6 and if he turned to ashes the cities of Sodom and Gomorrah when he condemned them to destruction, having appointed them to serve as an example to future generations of the ungodly, 7 and if he rescued Lot, a righteous man in anguish over the debauched lifestyle of lawless men, 8 (for while he lived among them day after day, that righteous man was tormented in his righteous soul by the lawless deeds he saw and heard) 9 —if so, then the Lord knows how to rescue the godly from their trials, and to reserve the unrighteous for punishment at the day of judgment, 10 especially those who indulge their fleshly desires and who despise authority. Brazen and insolent, they are not afraid to insult the glorious ones,