1:22א׳:כ״ב
1 א

ויברך אותם. לְפִי שֶׁמְּחַסְּרִים אוֹתָם וְצָדִין מֵהֶם וְאוֹכְלִין אוֹתָם, הֻצְרְכוּ לִבְרָכָה, וְאַף הַחַיּוֹת הֻצְרְכוּ לִבְרָכָה, אֶלָּא מִפְּנֵי הַנָּחָשׁ שֶׁעָתִיד לִקְלָלָה, לְכָךְ לֹא בֵרְכָן, שֶׁלֹּא יְהֵא הוּא בִכְלָל:

ויברך אותם AND HE BLESSED THEM — Because people decreased their number, hunting them and eating them, they needed a blessing (Genesis Rabbah 11:2); it is true that beasts also were in need of a blessing, but on account of the serpent that was to be cursed in the future, He did not bless them, in order that it might not be included in the blessing.

2 ב

פרו. לְ' פְּרִי כְּלוֹ' עֲשׁוּ פֵּרוֹת:

פרו BE FRUITFUL — פרו is of the same root as פרי, and means bring forth fruit.

3 ג

ורבו. אִם לֹא אָמַר אֶלָּא פְּרוּ, הָיָה אֶחָד מוֹלִיד אֶחָד וְלֹא יוֹתֵר, וּבָא וּרְבוּ שֶׁאֶחָד מוֹלִיד הַרְבֵּה:

ורבו AND MULTIPLY — Had He said “Be fruitful” only, one creature might have brought forth a single one, and no more, therefore He added ורבו “and multiply”, implying that one should bring forth many.