נח איש צדיק תמים היה בדרתיו כי אתך ראיתי צדיק לפני בדר הזה
The Ksav Sofer notes the description of Noach, tzaddik tamim, righteous and perfect – which is found in the opening pasuk of the parsha, as opposed to the later reference to him only as a tzaddik – as he and his family are summoned to enter the Teivah, Ark. What changed from the earlier Noach to the later Noach? He explains that the transformation came as a result of his fathering three sons, one of whom was a morally reprehensible, pernicious individual, who refused to bow to authority. Apparently, a flaw had resided in the tzaddik tamim if he had…