Hebrews 11:19

That is, "from which, figuratively speaking," it is possible to understand it this way: From where Abraham also brought Isaac in a figure. For he says, he demonstrated some overwhelming obedience, and faith that overcame even the laws of nature, he again receives the son, …

Give me your attention, you who have approached God, who believe yourselves to be faithful. Consider diligently how the faith of the faithful is proved from these words that have been read to us. "After these things," the text says, "God tested Abraham and said to him, 'Abraham, Abraham.' And he said, 'Here I am.' " Observe each detail that has been written. For, if one knows how to dig into the depth, one will find a treasure in the details. Perhaps also the precious jewels of the mysteries lie hidden where they are not esteemed.This man was previously called Abram. Nowhere do we read that God called him by this name or said to him, "Abram, Abram." For God could not call him by a name that was to be abolished, but he calls him by this name which God gave; and not only does God call him by this name, but he also repeats it. And when he had responded, "Here I am," God says to him, "Take your dearest son Isaac, whom you love, and offer him to me. Go," the text says, "into the high land, and there you shall offer him for a holocaust upon one of the mountains which I shall show you." Why God gave him this particular name and called him Abraham, he himself has interpreted. "Because," the text says, "I have made you a father of many nations." God gave him this promise when he had his son Ishmael, but it is promised him that the promise will be fulfilled in a son who will be born of Sarah. He had kindled his soul, therefore, in love for his son not only because of posterity but also in the hope of the promises. But this son, in whom these great and marvelous promises have been made, this son, I say, on whose account his name is called Abraham, "he is ordered to offer for a holocaust to the Lord on one of the mountains." What do you say to these things, Abraham? What kind of thoughts are stirring in your heart? […]

God promised to bring to light a vast number of Isaac's offspring like sand on the seashore, and he it was who bade Isaac become a victim. Beset by the two conflicting thoughts, then, and with nature tearing at him more harshly than any torturer, …

And how this was, the Apostle himself has taught us, by saying, "accounting that God was able to raise Him up, even from the dead." By the same faith (he means) by which he believed that God gave what was not, and raised up the dead, by the same was he persuaded that He would also raise him up after he had been slain in sacrifice. For it was alike impossible (to human calculation, I mean) from a womb which was dead and grown old and already become useless for child-bearing to give a child, and to raise again one who had been slain. But his previous faith prepared the way for things to come. And see; the good things came first, and the hard things afterwards, in his old age. But for you, on the contrary, (he says) the sad things are first, and the good things last. This for those who dare to say, "He has promised us the good things after death; perhaps He has deceived us." He shows that "God is able to raise up even from the dead," and if God be able to raise from the dead, without all doubt He will pay all that He has promised. But if Abraham so many years before, believed "that God is able to raise from the dead," much more ought we to believe it. Thou seest (what I at first said) that death had not yet entered in and yet He drew them at once to the hope of the resurrection, and led them to such full assurance, that when bidden, they even slay their own sons, and readily offer up those from whom they expected to people the world.

And hence he was not afraid to say, that God was "able to raise him up, even from the dead." "From whence also he received him in a figure," that is in idea, by the ram, he means. How? The ram having been slain, he was saved: so that by means of the ram he received him again, having slain it in his stead. But these things were types: for here it is the Son of God who is slain. And observe, I beseech you, how great is His lovingkindness. For inasmuch as a great favor was to be given to men, He, wishing to do this, not by favor, but as a debtor, arranges that a man should first give up his own son on account of God's command, in order that He Himself might seem to be doing nothing great in giving up His own Son, since a man had done this before Him; that He might be supposed to do it not of grace, but of debt. For we wish to do this kindness also to those whom we love, others, to appear first to have received some little thing from them, and so give them all: and we boast more of the receiving than of the giving; and we do not say, We gave him this, but, We received this from him. "From whence also" (are his words) "he received him in a figure," i.e. as in a riddle (for the ram was as it were a figure of Isaac) or, as in a type. For since the sacrifice had been completed, and Isaac slain in purpose, therefore He gave him to the Patriarch.