How do we know that Noah preached righteousness?

Noah's role as a 'preacher of righteousness' is captured in his decades-long ministry, where he warned the people of God's impending judgment. This preaching was not about offering a popular message of comfort but about proclaiming God's holiness and the severity of sin. He called people to repentance, emphasizing that judgment was coming and that salvation was available only through the ark, which typologically points to Jesus Christ. His unwavering commitment to God's message illustrates the prophetic nature of true righteousness in a wicked generation.