Hebrews 11:17-19

The sacrificing of Isaac is to be estimated according to the purpose of the heart: for it was not owing to Abraham that he did not actually perform what he was commanded to do. His resolution to obey was then the same, as though he had actually sacrificed his son.

And offered up his only-begotten Son, etc. By these various circumstances, the Apostle intended to show, how great and how severe the trial of Abraham was; and there are still other things related by Moses, which had the same tendency. Abraham was commanded to take his own son, his only begotten and beloved son Isaac, to lead to the place, which was afterwards to be shown to him, and there to sacrifice him with his own hands. These tender words God seems to have designedly accumulated, that he might pierce the inmost heart of the holy man, as with so many wounds; and then that he might more severely try him, he commanded him to go a three-days’ journey. How sharp, must we think, was his anguish to have continually before his eyes his own son, whom he had already resolved to put to a bloody death! As they were coming to the place, Isaac pierced his breast with yet a new wound, by asking him, “Where is the victim?” The death of a son, under any circumstances, must have been very grievous, a bloody death would have still caused a greater sorrow; but when he was bidden to slay his own, — that indeed must have been too dreadful for a father’s heart to endure; and he must have been a thousand times disabled, had not faith raised up his heart above the world. It is not then without reason, that the apostle records that he was then tried.

It may, however, be asked, why is Isaac called the only begotten, for Ishmael was born before him and was still living. To this the answer is, that by God’s express command he was driven from the family, so that he was accounted as one dead, at least, he held no place among Abraham’s children.

And he that received the promises, etc. All the things we have hitherto related, however deeply they must have wounded the heart of Abraham, yet they were but slight wounds compared with this trial, when he was commanded, after having received the promises, to slay his son Isaac; for all the promises were founded on this declaration, “In Isaac shall thy seed be called,” (Genesis 21:12;) for when this foundation was taken away, no hope of blessing or of grace remained. Here nothing earthly was the matter at issue, but the eternal salvation of Abraham, yea, of the whole world. Into what straits must the holy man have been brought when it came to his mind, that the hope of eternal life was to be extinguished in the person of his son? And yet by faith he emerged above all these thoughts, so as to execute what he was commanded. Since it was a marvelous fortitude to struggle through so many and so great obstacles, justly is the highest praise awarded to faith, for it was by faith alone that Abraham continued invincibly.

But here arises no small difficulty, How is it that Abraham’s faith is praised when it departs from the promise? For as obedience proceeds from faith, so faith from the promise; then when Abraham was without the promise, his faith must have necessarily fallen to the ground. But the death of Isaac, as it has been already said, must have been the death as it were of all the promises; for Isaac is not to be considered as a common man, but as one who had Christ included in him. This question, which would have been otherwise difficult to be solved, the Apostle explains by adding immediately, that Abraham ascribed this honor to God, that he was able to raise his son again from the dead. He then did not renounce the promise given to him, but extended its power and its truth beyond the life of his son; for he did not limit God’s power to so narrow bounds as to tie it to Isaac when dead, or to extinguish it. Thus he retained the promise, because he bound not God’s power to Isaac’s life, but felt persuaded that it would be efficacious in his ashes when dead no less than in him while alive and breathing.