How do we know Noah was righteous?

Noah's righteousness is attributed to his faith in God. Hebrews 11:7 states that 'by faith, Noah, being warned of God of things not seen as yet, moved with fear, prepared an ark to the saving of his house.' This act of faith demonstrated his obedience and trust in God's promise, which led to his being 'seen righteous' by God. Noah's life exemplified a model of faith that is consistent with sovereign grace theology, showcasing how belief in God results in salvation and righteous standing before Him.