פירוש על בראשית 7:1

ראיתי צדיק [THEE] HAVE I SEEN RIGHTEOUS — It does not say “righteous and wholehearted” (as it does at the beginning of the Sedrah); hence we may infer that only a part of a man’s good qualities should be enumerated in his presence (since here God is speaking to Noah and calls him only “righteous”), but that in his absence the whole of his good qualities may be told (since when the Torah speaks about him in the earlier passage it calls him “righteous and wholehearted”) (Eruvin 18b).

AND THE ETERNAL SAID TO NOAH. G-d informed Noah that with the attribute of mercy [as indicated by the use of the Tetragrammaton, “the Eternal,”] He will save him and his family and that He will give life to their seed for all generations. This is the meaning of the phrase, to keep seed alive upon the face of all the earth.⁷¹Verse 3. At first He said, to keep them alive with thee;⁷²Above, 6:19. but now with the attribute of mercy He hinted to him concerning the sacrifice to inform him that he will have regard for his offering and that by the merit of his offering, the world will exist, never again to be cut off by the waters of the flood.⁷³See further, 9:11. This is why the Tetragrammaton is mentioned here for in all matters concerning the sacrifices, Scripture does not mention Elokim (G-d), as I will elucidate when I reach there⁷⁴See Ramban, Leviticus 1:9. with the help of G-d.

ויאמד…בא אל התיבה. G'd said…."enter the ark!." Why did G'd have to repeat here that He had seen that Noach was a righteous man in his generation? G'd may have feared that Noach would misinterpret the command to enter the ark together with all his immediate family. He might have thought a) that every family member would be saved due to his or her individual merit; in that case the Torah should not have addressed the command to build the ark to Noach in the singular; b) he might have thought that his wife, children, and their respective wives were being saved because they had not yet reached the age of accountability. If Noach had thought this he might have been tempted to invite all those of his friends who were young enough to share the ark with him in order to survive. Even if he had not done so on his own initiative, he might have wondered why all these youngsters were doomed to perish.