Aphrahat the Persian Sage : For the name of Divinity is given for the highest honor in the world, and with whomsoever God is well pleased, he applies it to him. But however, the names of God are many and are venerable, as he delivered his names to Moses, saying to him, "I am the God of your fathers, the God of Abraham and the God of Isaac and the God of Jacob. This is my name forever, and this is my memorial unto generations." And he called his name "Ahiyah ashar Ahiyah," "El Shaddai" and "Adonai Sabaoth." By these names God is called. The great and honorable name of Godhead he withheld not from his righteous ones; even as, though he is the great king, without grudging he applied the great and honorable name of kingship to men who are his creatures. — DEMONSTRATIONS 17.5 Aphrahat the Persian Sage : And when the holy One called Moses from the bush he said thus to him: "I am the God of Abraham, of Isaac and of Jacob." When Death heard this utterance, he trembled and feared and was terrified and perturbed and knew that he had not become king forever over the children of Adam. From the hour that he heard God saying to Moses, "I am the God of Abraham, of Isaac and of Jacob," Death [struck] his hands together, for he learned that God is king of the dead and of the living and that it is appointed to the children of Adam to come forth from his darkness and arise with their bodies. And observe that our Redeemer Jesus also, when he repeated this utterance to the Sadducees, when they were disputing with him about the resurrection of the dead, thus said, "God is not [God] of the dead, for all are alive unto him." — DEMONSTRATIONS 22.2 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." — TRACTATE ON THE GOSPEL OF John 11.7.2-8.2 Cyril of Alexandria : But the Savior also demonstrated the great ignorance of the Sadducees by bringing forward their own hierophant Moses, who was well and clearly acquainted with the resurrection of the dead. For he has set before us God, he says, as saying in the bush, "I am the God of Abraham, and the God of Isaac and the God of Jacob." But of whom is he God, if, according to their argument, these have ceased to live? For he is the God of the living; and therefore certainly and altogether they will rise, when his almighty right hand brings them thereunto; and not them only but also all who are upon the earth. — HOMILIES ON THE GOSPEL OF Luke 136 Gregory of Nazianzus : Of the other titles, some are evidently names of his authority, others of his government of the world, and of this viewed under a twofold aspect: the one before, the other in, the incarnation. For instance, the Almighty, the King of Glory, or of the Ages, or of the Powers, or of the Beloved or of Kings. Or again, the Lord of Sabaoth, that is, of hosts, or of powers or of lords; these are clearly titles belonging to his authority. But the God either of salvation or of vengeance, or of peace, or of righteousness, or of Abraham, Isaac and Jacob, and of all the spiritual Israel that sees God—these belong to his government. For since we are governed by these three things, the fear of punishment, the hope of salvation and of glory besides, and the practice of the virtues by which these are attained, the name of the God of vengeance governs fear, and that of the God of salvation our hope, and that of the God of virtues our practice; that whoever attains to any of these may, as carrying God in himself, press on yet more unto perfection and to that affinity which arises out of virtues. Now these are names common to the Godhead, but the proper name of the unoriginate is "Father," and that of the unoriginately begotten is "Son" and that of the unbegottenly proceeding or going forth is "the Holy Ghost." — THEOLOGICAL ORATION 4:19 Origen of Alexandria : Abraham sets forth, as it were, moral philosophy, through obedience. For so great was his obedience and observance of the commandments that, when he heard: "Go forth from your land, and from your kindred, and from the house of your father," he did not delay, but did it at once … For hearing that he should sacrifice his son, not even then does he doubt, but he obeys the precept: and, to give to posterity an example of the obedience which is moral philosophy, he did not spare even his only son. Isaac also holds to natural philosophy, since he both digs wells and searches out the depths of things. But Jacob too holds the inspective place, inasmuch as he was named Israel on account of the contemplation of divine things, and saw the camps of heaven, and beheld the house of God and the ways of the angels — that is, the ladder stretched out from earth to heaven. — COMMENTARY ON THE SONG OF SONGS, PROLOGUE Origen of Alexandria : God has been recorded indeed to be the God "of Abraham, and the God of Isaac and the God of Jacob." He indeed who wishes the light to belong to none other than men (because it is said, "The life was the light of men") will think, according to this analogy, that the God of Abraham and the God of Isaac and the God of Jacob is the God of no one except these three fathers alone. But he is at least also the God of Elijah, and, as Judith says, the God of her father Simeon, and he is God of the Hebrews. Wherefore, according to the analogy, if nothing prevents him from being the God of others also, nothing prevents the light of men from also being the light of other creatures besides men. — COMMENTARY ON THE GOSPEL OF John 2.143 Origen of Alexandria : If the God of the universe, having been made familiar to the saints, becomes their God, the being named the God of Abraham and the God of Isaac and the God of Jacob, by how much more will it be possible for the Holy Spirit, having been made familiar to the prophets, to be called their spirit, that the Spirit might thus be said to be the spirit of Elijah and the spirit of Isaiah? — COMMENTARY ON THE GOSPEL OF John 6.68