Here is Noah's ready obedience to the commands that God gave him. Observe, 1. He went into the ark, upon notice that the flood would come after seven days, though probably as yet there appeared no visible sign of its approach, no cloud arising that threatened it, nothing done towards it, but all continued serene and clear; for, as he prepared the ark by faith in the warning given that the flood would come, so he went into it by faith in this warning that it would come quickly, though he did not see that the second causes had yet begun to work. In every step he took, he walked by faith, and not by sense. During these seven days, it is likely, he was settling himself and his family in the ark, and distributing the creatures into their several apartments. This was the conclusion of that visible sermon which he had long been preaching to his careless neighbours, and which, one would think, might have awakened them; but, not obtaining that desired end, it left their blood upon their own heads. 2. He took all his family along with him, his wife, to be his companion and comfort (though it should seem that, after this, he had no children by her), his sons, and his sons' wives, that by them not only his family, but the world of mankind, might be built up. Observe, Though men were to be reduced to so small a number, and it would be very desirable to have the world speedily repeopled, yet Noah's sons were each of them to have but one wife, which strengthens the argument against having many wives; for from the beginning of this new world it was not so: as, at first, God made, so now he kept alive, but one woman for one man. See Mat 19:4, Mat 19:8. 3. The brute creatures readily went in with him. The same hand that at first brought them to Adam to be named now brought them to Noah to be preserved. The ox now knew his owner, and the ass his protector's crib, nay, even the wildest creatures flocked to it; but man had become more brutish than the brutes themselves, and did not know, did not consider, Isa 1:3.

For yet seven days - God spoke these words probably on the seventh or Sabbath day, and the days of the ensuing week were employed in entering the ark, in embarking the mighty troop, for whose reception ample provision had been already made.
Forty days - This period became afterwards sacred, and was considered a proper space for humiliation. Moses fasted forty days, Deu 9:9, Deu 9:11; so did Elijah, Kg1 19:8; so did our Lord, Mat 4:2. Forty days' respite were given to the Ninevites that they might repent, Jon 3:4; and thrice forty (one hundred and twenty) years were given to the old world for the same gracious purpose, Gen 6:3. The forty days of Lent, in commemoration of our Lord's fasting, have a reference to the same thing; as each of these seems to be deduced from this primitive judgment.

And it came to pass after seven days,.... Were ended, or on the seventh day, after God had given the orders to Noah, to prepare for his going into the ark, with his family, and all the creatures:

that the waters of the flood were upon the earth: that is, they began to be upon the earth; for it continued to rain from hence forty days and forty nights; and still the waters continued to increase, and it was an hundred and fifty days before they began to ebb.

There went in two and two--Doubtless they were led by a divine impulse. The number would not be so large as at first sight one is apt to imagine. It has been calculated that there are not more than three hundred distinct species of beasts and birds, the immense varieties in regard to form, size, and color being traceable to the influence of climate and other circumstances.