כָּל הַחַיָּה כָּל הָרֶמֶשׂ וְכָל הָעוֹף כֹּל רוֹמֵשׂ עַל הָאָרֶץ לְמִשְׁפְּחֹתֵיהֶם יָצְאוּ מִן הַתֵּבָה
Every living thing, every creeping thing and every flying thing – everything that moves on earth – came out of the ark according to its families.
_____
In the chapters of creation we learned about the law of למיניהם, all created things were to live within their boundaries and within their species.
Upon exiting the ark the Torah repeats this law. This law will now accompany all the organic living creatures.
(In 7:16 RSRH, immediately prior to the Mabul, points out that only the animals that came in pairs, male and female, were allowed on the ark. Man had degenerated and with it so had much of the animal kingdom.)
See commentary on 6:13. There RSRH writes that the Mabul was the inevitable result of the violation of the law of למיניהו. The world cannot flourish and continue serving man when man is no longer sexually pure. In his words, “The thriving of the species depends on the purity of sexual life.” Had God not intervened and brought about the Mabu even the spark of purity which was to be saved through Noach would have beeb irrevocably lost. (see more on that verse, pages 180-181)
(see Beraishis 1:11-13 here and here)
Beraishis 8:19
page 206
