Genesis 7:8

8. Of clean beasts. Moses now explains, — what had before been doubtful, — in which manner the animals were gathered together into the ark, and says that they came of their own accord. If this should seem to any one absurd, let him recall to mind what was said before, that in the beginning every kind of animals presented themselves to Adam, that he might give them names. And, truly, we dread the sight of wild beasts from no other cause than this, that seeing we have shaken off the yoke of God, we have lost that authority over them with which Adam was endued. Now, it was a kind of restoration of the former state of things when God brought to Noah those animals which he intended should be preserved through Noah’s labor and service. For Noah retained the untamed animals in his ark, in the very same way in which hens and geese are preserved in a coop. And it is not superfluously added, that the animals themselves came, as God had instructed Noah; for it shows that the blessing of God rested on the obedience of Noah, so that his labor should not be in vain. It was impossible, humanly speaking, that in a moment such an assemblage of all animals should take place; but because Noah, simply trusting the event with God, executed what was enjoined upon him; God, in return, gave power to his own precept, that it might not be without effect. Properly speaking, this was a promise of God annexed to his commands. And, therefore, we must conclude, that the faith of Noah availed more, than all snares and nets, for the capture of animals; and that, by the very same gate, lions, and wolves, and tigers, meekly entered, with oxen, and with lambs, into the ark. And this is the only method by which we may overcome all difficulties; while, — being persuaded, that what is impossible to us is easy to God, — we derive alacrity from hope. It has before been stated that the animals entered in by pairs. We have also related the different opinions of interpreters respecting the month in which the deluge took place. For since the Hebrews begin their year in sacred things from March, but in earthly affairs from September; or, — which is the same thing, — since the two equinoxes form with them a double commencement of the year, some think that the sacred year, and some the political, is here intended. But because the former method of reckoning the years was Divinely appointed, and is also more agreeable to nature, it seems probable that the deluge began about the time of spring.