This is the account of Noah. Noah was a righteous man, blameless in his generation; Noah walked with God. — Genesis 6:9

Noah was a just man, perfect in his generations, and he walked with God. But make no mistake — the just shall live by faith. Noah's righteousness wasn't his own. It was received. After the flood, Noah built an altar and offered burnt offerings, foreshadowing the Lamb slain from the foundation of the world.