Genesis 1:28

And God blessed them,.... The man and the woman he had made, with all the blessings of nature and Providence; with all the good things of life; with his presence, and with communion with himself in a natural way, through the creatures; and particularly with a power of procreating their species, as follows;and God said unto them, be fruitful, and multiply, and replenish the earth: if this is not an express command, as the Jews understand it, for marriage and procreation of children, it seems to be more than a bare permission; at least it is a direction and an advice to what was proper and convenient for the increase of mankind, and for the filling of the earth with inhabitants, which was the end of its being made, Isa 45:18.