Genesis 22:13

Thus the sacrifice was not for the sake of Isaac but for that of Abraham, who was tested by being called upon to make this offering. And of course, God accepted his intentions, but he prevented him from slaying Isaac. The death of Isaac would not buy freedom for the world. No, that could be accomplished only by the death of our Savior, by whose stripes we are all healed.

We said above, I think, that Isaac represented Christ. But this ram no less also seems to represent Christ. Now it is worthwhile to know how both are appropriate to Christ, both Isaac, who is not slain, and the ram, which is slain.Christ is "the Word of God," but "the Word was made flesh." One aspect of Christ therefore is from above; the other is received from human nature and the womb of the Virgin. Christ suffered, therefore, but in the flesh; and he endured death, but it was the flesh, of which this ram is a type, as also John said: "Behold the Lamb of God, behold him who takes away the sin of the world." But the Word continued "in incorruption," which is Christ according to the spirit, of which Isaac is the image. For this reason he is victim and priest. For truly according to the spirit he offers the victim to the Father, but according to the flesh he himself is offered on the altar of the cross. As it is said of him, "Behold the Lamb of God, behold him who takes away the sin of the world," so it is said of him, "You are a priest forever according to the order of Melchizedek."

The mountain spit out the tree and the tree the ram. In the ram that hung in the tree and had become the sacrifice in the place of Abraham's son, there might be depicted the day of him who was to hang upon the wood …

(Verse 13.) And Abraham lifted up his eyes, and behold, behind him was a ram caught in a thicket by its horns. Emisenus Eusebius has spoken a silly thing in this place: Sabech, he says, is called a goat, which with straight horns is raised high to pluck the leaves from a tree. Again Aquila has interpreted as a bush, which we can call a thicket or briar: and to interpret the force of the word, dense and intertwined twigs. And Symmachus also expresses the same opinion, saying, 'And it appeared that a ram, after this, was caught in a net by its horns.' However, some have interpreted it better in this particular place, namely the Septuagint and Theodotion, who translated the word as 'Sabech,' saying, 'In the thicket Sabech with its horns.' For σύχνεων, that is, the net, which Aquila and Symmachus have used, is written with the letter 'Sin.' But here the letter 'Samech' is used. From this it is clear that the interpretation is not of thickened branches, and like the word 'Sabech' intertwined like a net with intertwined branches, but rather the name signifies a thicket, which is thus expressed in Hebrew. But in my diligent investigation, I frequently found that the letter συχνεῶνα is often written as Samech ().

All this, however, happened as a type of the cross. Hence Christ too said to the Jews, "Your father Abraham rejoiced in anticipation of seeing my day; he saw it and was delighted." How did he see it if he lived so long before? In type, in shadow. Just as in our text the sheep was offered in place of Isaac, so here the rational Lamb was offered for the world. You see, it was necessary that the truth be sketched out ahead of time in shadow. Notice, I ask you, dearly beloved, how everything was prefigured in shadow: an only-begotten son in that case, an only-begotten in this; dearly loved in that case, dearly loved in this. "This is my beloved Son," Scripture says, in fact, "in whom I have found satisfaction." The former was offered as a burnt offering by his father, and the latter his Father surrendered. Paul too shouts aloud in the words "He who in fact did not spare his own Son but handed him over for the sake of us all—how will he not also grant us every gift along with him?" Up to this point there is shadow, but now the truth of things is shown to be more excellent. This rational Lamb, you see, was offered for the whole world; he purified the whole world; he freed human beings from error and led them forward to the truth; he made earth into heaven, not by altering the nature of the elements but by transferring life in heaven to human beings on earth. Through him all worship of demons is made pointless; through him people no longer worship stone and wood. Nor do those endowed with reason bend the knee to material things—instead, all error has been abolished, and the light of truth has shone brightly on the world. Do you see the superiority of the truth? Do you see what shadow is, on the one hand, and truth, on the other?