Genesis 7:16

And they that went in went in male and female of all flesh, as God had commanded him. And the Lord shut him in. Time and again the emphasis is placed upon the exact manner in which the command of God was carried out. All the mammals of every kind, according to genera and species, had assembled, likewise the birds and the reptiles, in the interval of seven days after the Lord's first announcement. The family of Noah had likewise been obedient to the command of God, to the last letter. The embarkation had thus been completed just as God had outlined it before the Flood began. And the Lord Himself locked the door after Noah. All the clamoring of men for admission after the beginning of the predicted catastrophe would be vain, their repentance would come too late. Let no man be deceived; the same God that brought the Deluge upon a fallen race is living today, and He is not mocked. To continue in trespass in the face of the plain words of the Lord is a dangerous proceeding, to say the least. We know that a punishment, even greater and more terrible than the Deluge, is coming at the end of the world. The heavens and the earth which are now, by the same word are kept in store, reserved unto fire against the Day of Judgment and perdition of ungodly men, 2 Peter 3:7. Then will the fire of divine wrath burn through all eternity.