Moreover he said,
I am the God of your father, the God of Abraham, the God of Isaac, and
the God of Jacob.
And Moses hid his face; for he was afraid to look upon God.
All Commentaries on Exodus 3:6 Go To Exodus 3
Augustine of Hippo
God gives witness and says, “I am the God of Abraham, the God of Isaac and the God of Jacob.” Were there not other patriarchs? Was not Noah a holy man before these, who alone in the whole human race together with his whole house deserved to be delivered from the flood, in whom and in his sons the church is represented? They escape the flood, with wood carrying them. And then afterwards [come] the great men whom we know, whom Holy Scripture commends, Moses faithful in all his house. And those three are named, as if they alone were deserving of him: “I am the God of Abraham, the God of Isaac and the God of Jacob; this is my name forever.” An enormous mystery! The Lord has the power to open both our mouths and your hearts that we may be able to speak as he has deigned to reveal and that you may be able to grasp as it is advantageous to you. Therefore those patriarchs are three: Abraham, Isaac and Jacob. You already know that the sons of Jacob were twelve and from them are the people of Israel because Jacob himself is Israel and the people of Israel are the twelve tribes belonging to the twelve sons of Israel. Abraham, Isaac and Jacob, three fathers and one people. Three fathers, as it were, in the beginning of the people; three fathers in whom the people was prefigured. And the earlier people itself [is] the present people. For in the people of the Jews the people of the Christians was prefigured. There a figure, here the truth; there a shadow, here the body, as the apostle says, “Now these things happened to them in figure.” It is the apostle’s voice, and he says, “They were written for us, upon whom the end of the world has come.” Let your mind return to Abraham, Isaac and Jacob. In those three we find free women giving birth and bondwomen giving birth. We find there the progeny of free women; we find there also the progeny of bondwomen. The bondwoman signifies nothing good. “Cast out the bondwoman,” [Scripture] says, “and her son; for the son of the bondwoman will not be heir with the son of the free woman.” The apostle mentions this; and in these two sons of Abraham the apostle says was a figure of the two Testaments, Old and New. To the Old Testament belong the lovers of temporal things, the lovers of the world; to the New Testament belong the lovers of eternal life. Therefore that Jerusalem on earth was a shadow of the heavenly Jerusalem, the mother of us all, which is in heaven. And these are the apostle’s words. And about that city from which we are sojourners you know many things, you have already heard many things. Now we find something remarkable in these births, that is, in these offspring, in these procreations of free women and bondwomen, namely, four types of men. And in these four types of men is comprised the figure of the Christian people, so that what was said in regard to these three is not astonishing: “I am the God of Abraham, the God of Isaac and the God of Jacob.” –..