Hebrews 11:17

And he shows another thing too, by saying, that "God tempted Abraham." What then? Did not God know that the man was noble and approved? Why then did He tempt him? Not that He might Himself learn, but that He might show to others, and make his fortitude manifest to all. And here also he shows the cause of trials, that they may not suppose they suffer these things as being forsaken of God. For in their case indeed, it was necessary that they should be tried, because there were many who persecuted or plotted against them: but in Abraham's case, what need was there to devise trials for him which did not exist? Now this trial, it is evident, was by His command. The others indeed happened by His allowance, but this even by His command. If then temptations make men approved in such wise that, even where there is no occasion, God exercises His own athletes; much more ought we to bear all things nobly. And here he said emphatically, "By faith, when he was tried, he offered up Isaac," for there was no other cause for his bringing the offering but that.

Great indeed was the faith of Abraham. For while in the case of Abel, and of Noah, and of Enoch, there was an opposition of reasonings only, and it was necessary to go beyond human reasonings; in this case it was necessary not only to go beyond human reasonings, but to manifest also something more. For what was of God seemed to be opposed to what was of God; and faith opposed faith, and command promise. I mean this: He had said, "Get thee out of thy country, and from thy kindred, and I will give thee this land." "He gave him none inheritance in it, no not so much as to set his foot on." Seest thou how what was done was opposed to the promise? Again He said, "In Isaac shall thy seed be called," and he believed: and again He says, Sacrifice to Me this one, who was to fill all the world from his seed. Thou seest the opposition between the commands and the promise? He enjoined things that were in contradiction to the promises, and yet not even so did the righteous man stagger, nor say he had been deceived.

He heard the opposite of the promises from Him who had made them; and yet he was not disturbed, but did them as if they had been in harmony therewith. For they were in harmony; being opposed indeed according to human calculations, but in harmony when viewed by Faith.

In whose similitude but His of whom the apostle says, "He that spared not His own Son, but delivered Him up for us all?" And on this account Isaac also himself carried to the place of sacrifice the wood on which he was to be offered up, just as the Lord Himself carried His own cross. Finally, since Isaac was not to be slain, after his father was forbidden to smite him, who was that ram by the offering of which that sacrifice was completed with typical blood? For when Abraham saw him, he was caught by the horns in a thicket. What, then, did he represent but Jesus, who, before He was offered up, was crowned with thorns by the Jews?