And they went in, etc. - It was physically impossible for Noah to have collected such a vast number of tame and ferocious animals, nor could they have been retained in their wards by mere natural means. How then were they brought from various distances to the ark and preserved there? Only by the power of God. He who first miraculously brought them to Adam that he might give them their names, now brings them to Noah that he may preserve their lives. And now we may reasonably suppose that their natural enmity was so far removed or suspended that the lion might dwell with the lamb, and the wolf lie down with the kid, though each might still require his peculiar aliment. This can be no difficulty to the power of God, without the immediate interposition of which neither the deluge nor the concomitant circumstances could have taken place.

And they went in unto Noah into the ark, two and two (f) of all flesh, wherein [is] the breath of life.
(f) Every living thing that God would have be preserved on earth, came into the ark to Noah.

And they went in unto Noah into the ark,.... Noah went in first, and the creatures of themselves came to him, or were conducted by the ministry of angels; and they were delivered into his hands, and he placed them in the ark as was most convenient for them: it is very likely he went in and out as occasion required, for the better management and disposition of things; for he seems to be the last of all that went in, see Genesis 7:16,
two and two of all flesh, wherein is the breath of life; they that went by sevens, yet being seven couples, as has been observed, as those which were only two or four, went by pairs: this is true of them all.