אלה תולדת נח נח איש צדיק. הוֹאִיל וְהִזְכִּירוֹ סִפֵּר בְּשִׁבְחוֹ, שֶׁנֶּאֱמַר זֵכֶר צַדִּיק לִבְרָכָה (משלי י'). דָּבָר אַחֵר לִמֶּדְךָ שֶׁעִקַּר תּוֹלְדוֹתֵיהֶם שֶׁל צַדִּיקִים מַעֲשִׂים טוֹבִים:
אלה תולדת נח נח איש צדיק THESE ARE THE PROGENY OF NOAH: NOAH WAS A RIGHTEOUS MAN — Since the text mentions him it sings his praise, in accordance with what is said, (Proverbs 10:7) “The mention of the righteous shall be for a blessing.” Another explanation is: since after stating “These are the progeny of Noah”, it does not at once mention the names of his children but declares that he “was a righteous man”, Scripture thereby teaches you that the real progeny of righteous people are their good deeds (Genesis Rabbah 30:6).
בדרותיו. יֵשׁ מֵרַבּוֹתֵינוּ דּוֹרְשִׁים אוֹתוֹ לְשֶׁבַח, כָּל שֶׁכֵּן אִלּוּ הָיָה בְדוֹר צַדִּיקִים הָיָה צַדִּיק יוֹתֵר; וְיֵשׁ שֶׁדּוֹרְשִׁים אוֹתוֹ לִגְנַאי, לְפִי דוֹרוֹ הָיָה צַדִּיק וְאִלּוּ הָיָה בְדוֹרוֹ שֶׁל אַבְרָהָם לֹא הָיָה נֶחְשָׁב לִכְלוּם (סנה' ק"ח):
בדורותיו IN HIS GENERATIONS — Some of our Rabbis explain it (this word) to his credit: he was righteous even in his generation; it follows that had he lived in a generation of righteous people he would have been even more righteous owing to the force of good example. Others, however, explain it to his discredit: in comparison with his own generation he was accounted righteous, but had he lived in the generation of Abraham he would have been accounted as of no importance (cf. Sanhedrin 108a).
את האלהים התהלך נח. וּבְאַבְרָהָם הוּא אוֹמֵר אֲשֶׁר הִתְהַלַּכְתִּי לְפָנָיו? (ברא' כ"ד), נֹחַ הָיָה צָרִיךְ סַעַד לְתָמְכוֹ, אֲבָל אַבְרָהָם הָיָה מִתְחַזֵּק וּמְהַלֵּךְ בְצִדְקוֹ מֵאֵלָיו:
את האלהים התהלך נח NOAH WALKED WITH GOD — In the case of Abraham Scripture says, (Genesis 24:40) ‘‘[God] before whom I walked”; Noah needed God’s support to uphold him in righteousness, Abraham drew his moral strength from himself and walked in his righteousness by his own effort (Genesis Rabbah 30:10).
התהלך. לְשׁוֹן עָבָר, וְזֶהוּ שִׁמּוּשׁוֹ שֶׁל לָשׁוֹן, בְּלָשׁוֹן כָּבֵד מְשַׁמֶּשֶׁת לְהַבָּא וּלְשֶׁעָבַר בְּלָשׁוֹן א', קוּם הִתְהַלֵּךְ (שם י"ג) לְהַבָּא, הִתְהַלֶּךְ נֹחַ לְשֶׁעָבַר; הִתְפַּלֵּל בְּעַד עֲבָדֶיךָ (שמואל א' י"ב) לְהַבָּא, וּבָא וְהִתְפַּלֵּל אֶל הַבַּיִת הַזֶּה (מ"א ח') לְשׁוֹן עָבָר, אֶלָּא שֶׁהַוָּי"ו שֶׁבְּרֹאשׁוֹ הֲפָכוֹ לְהַבָּא:
התהלך HE WALKED — This word is in the past tense. The following is the usage of this verbal form: in the “heavy” (כבד) conjugation one grammatical form is used both as future (i. e. the imperative, since the imperative calls for on action to be done in the future relative to the time when the command is given) and as past tense e. g., (13:17) קום התהלך “arise walk” is future (i. e. imperative); התהלך נח “Noah walked” (in this passage) is past; (1 Samuel 12:19) התפלל בעד עבדיך “Pray for thy servants” is future (i. e. imperative) and (1 Kings 8:42) ובא והתפלל אל הבית הזה “When he shall come and shall pray toward this house” is past, only that the ו at the beginning of the word changes the tense into the future (it is Vav conversive).