John Calvin Commentary Genesis 22:3

"And Abraham rose early in the morning, and saddled his ass, and took two of his young men with him, and Isaac his son. And he clave the wood for the burnt-offering, and rose up, and went unto the place of which God had told him." — Genesis 22:3 (ASV)

And Abraham rose up early in the morning. This promptness shows the greatness of Abraham’s faith. Innumerable thoughts might have entered the mind of the holy man, each of which would have overwhelmed his spirit unless he had fortified it by faith.

And there is no doubt that Satan, during the darkness of the night, would have heaped upon him a great burden of cares. To overcome them gradually, by contending with them, was an act of heroic courage.

But when these were overcome, to then immediately gird himself to fulfill God's command, and even to rise early in the morning to do so, was a remarkable effort. Other men, overwhelmed by such a dreadful and terrible message, would have fainted and lain inactive, as if lifeless; but the first light of dawn was scarcely early enough for Abraham’s haste.

Therefore, in a few words, Moses highly praises his faith when he declares that it surmounted, in such a short time, the very temptation which was attended with many labyrinths.