John Calvin on Genesis 9:18-19

18. The sons of Noah . Moss enumerates the sons of Noah, not only because he is about to pass on to the following history, but for the purpose of more fully illustrating the force of the promise, “Replenish the earth.” For we may hence better conceive how efficacious the blessing of God has been, because an immense multitude of men proceeded in a short time from so small a number; and because one family, and that a little one, grew into so many, and such numerous nations.