Behold I will establish my covenant with you, and with your seed after you:

“God's purpose, therefore, was to eliminate all apprehension from Noah's thinking and for him to be quite assured that this would not happen again. He said, remember, "Just as I brought on the deluge out of love, so as to put a stop to their wickedness and prevent their going to further extremes, so in this case too it is out of my love that I promise never to do it again, so that you may live free of all dread and in this way see your present life to its close." Hence he said, "Behold, I make my covenant," that is, I form an agreement. Just as in human affairs when someone makes a promise he forms an agreement and gives a firm guarantee, so too the good Lord said, "Behold, I make my covenant." God did not say that this massive disaster might come again to those who sin. Rather he said, "Behold, I make my covenant with you and your offspring after you." See the Lord's loving kindness: not only with your generation, he says, do I form my agreement, but also in regard to all those coming after you I give this firm guarantee.”

“ואני הנני AND I BEHOLD I — “I am in agreement with you”; He said this because Noah feared to fulfil the duty of propagating the species until the Holy One, blessed be He, promised him that he would not again destroy the world and this promise God made (Midrash Tanchuma, Noach 11). Ultimately He said to him, “If you are still anxious I am willing to give to My promise the permanence and strength of a covenant and I will give you a sign.””

“And I, behold, I establish my covenant with you,.... Not the covenant of grace in Christ, but of the preservation of the creatures in common, a promise that they should not be destroyed any more by a flood; to which promise it seems an oath was annexed, as appears from Isa 54:9 which passage refers to this covenant, as Aben Ezra on the place observes; and both to raise attention to what is here affirmed, and to show the certainty of it, the word "behold" is prefixed to it; nor is it amiss what Jarchi observes, that this follows upon the direction and exhortation to procreation of children, and is an encouragement to it; since it is assured that posterity should be no more cut off in the manner it had been; for this covenant was made and established not only with Noah, and his sons, but with all their succeeding offspring, as follows: and with your seed after you; with all their posterity to the end of the world; so that this covenant was made with all the world, and all the individuals in it, from Noah's time to the end of it; for from him and his sons sprung the whole race of men that peopled the world, and still continue to inhabit it; hence here is nothing in it peculiar to the seed of believers.”