What does the Bible say about God's judgment in the days of Noah?

In Genesis 6, God observed that the wickedness of man was great on the earth and decided to bring judgment through the flood. He declared, 'I will destroy man whom I have created' (Genesis 6:7). This judgment was a response to the mingling of belief in God's grace with false teachings, leading to a society that opposed the gospel. The narrative highlights the seriousness of God's justice against unrepentant sin and His desire to uphold the gospel of grace through Noah, who found favor in God's eyes.