Genesis 9:1

1.And God blessed Noah. We hence infer with what great fear Noah had been dejected, because God, so often and at such length, proceeds to encourage him. For when Moses here says, that God blessed Noah and his sons, he does not simply mean that the favor of fruitfulness was restored to them; but that, at the same time, the design of God concerning the new restitution of the world was revealed unto them. For to the blessing itself is added the voice of God by which he addresses them. We know that brute animals produce offspring in no other way than by the blessing of God; but Moses here commemorates a privilege which belongs only to men. Therefore, lest those four men and their wives, seized with trepidation, should doubt for what purpose they had been delivered, the Lord prescribes to them their future condition of life: namely, that they shall raise up mankind from death to life. Thus he not only renews the world by the same word by which he before created it; but he directs his word to men, in order that they may recover the lawful use of marriage, may know that the care of producing offspring is pleasing to Himself, and may have confidence that a progeny shall spring from them which shall diffuse itself through all regions of the earth, so as to render it again inhabited; although it had been laid waste and made a desert. Yet he did not permit promiscuous intercourse, but sanctioned anew that law of marriage which he had before ordained. And although the blessing of God is, in some way, extended to illicit connections, so that offspring is thence produced, yet this is an impure fruitfulness; that which is lawful flows only from the expressly declared benediction of God.