Second Peter refers to Noah as a preacher of righteousness.
Second Peter 2:5 describes God preserving Noah, calling him a “preacher of righteousness,” along with seven others, while bringing the flood on the ancient world. This is the clearest biblical passage using that title for Noah.
The wording presents Noah as a figure who warned or proclaimed righteousness before the flood. Genesis itself calls Noah righteous and says he found favor with God, but its flood narrative does not use the exact title “preacher of righteousness.” That distinction makes 2 Peter the specific answer.
Noah is also mentioned in other biblical books. Jesus refers to the days of Noah in the Gospels of Matthew and Luke, and Hebrews 11 praises Noah's faith. These references emphasize different aspects of his story, so they should not be confused with 2 Peter's distinctive description.