10. RABBI ELAZAR ASKS: What is the meaning of "his generations" IN THE VERSE "perfect in his generations?" AND HE REPLIES THAT they are his descendants, who issued from him, all of whom he perfected THROUGH HIS RIGHTEOUSNESS and by whom he was also perfected. IN OTHER WORDS, THE VERSE "PERFECT IN HIS GENERATIONS" HAS TWO MEANINGS: (A) HIS WHOLENESS PERFECTED ALL THE GENERATIONS THAT DESCENDED FROM HIM, AND (B) HE WAS PERFECTED BY THE GENERATIONS THAT DESCENDED FROM HIM. ANOTHER EXPLANATION IS THAT Perfect MEANS that he was born circumcised. As it is written: "Walk before Me and be perfect" (Beresheet 17:1), MEANING CIRCUMCISED. "In his generations" includes only Noah's descendants and not the generations in the world in general because they descended from him. IN OTHER WORDS, EVEN THOUGH THE VERSE MEANS THAT HE WAS PERFECT IN ALL THE GENERATIONS OF THE WORLD, IT SAYS "HIS GENERATIONS" TO INDICATE THAT ALL THE GENERATIONS OF THE WORLD ARE HIS, AS THEY ALL DESCEND FROM HIM.
10. תָּמִים הָיָה בְּדוֹרוֹתָיו, מַאי בְּדוֹרוֹתָיו, אִלֵין אִינוּן דְּנָפְקוּ מִנֵּיהּ, הוּא אַשְׁלִים לְכָלְהוֹ, וְהוּא הֲוָה שְׁלִים מִכָּלְהוֹ, תָּמִים הָיָה דְּאִתְיְילִיד מָהוּל, דִּכְתִיב הִתְהַלֵּךְ לְפָנַי וֶהֱיֵה תָמִים. בְּדוֹרוֹתָיו, וְלֹא בְּדָרִין דְּעָלְמָא, דְּהָא מִנֵּיהּ נְפָקוּ תּוֹלְדוֹת בְּעָלְמָא.