THE GENERATIONS OF NOAH (Genesis 6:9; Genesis 9:28).
(9) Noah was a just man and perfect in his generations. — “Just” is, literally, righteous, one whose actions were sufficiently upright to exempt him from the punishment inflicted upon the rest of mankind. “Perfect” means sound, healthy, and conveys no idea of sinlessness. It answers to the Latin integer, whence our word integrity, and not to perfectus.
Generations (dôrôth) is not the same word as at the beginning of the verse (tôldôth), but simply means his contemporaries. And this he was because —
Noah walked with God. — See Note on Genesis 5:22.