“Take your son,” God said, “your only son Isaac, whom you love, and go to the land of Moriah. Offer him there as a burnt offering on one of the mountains, which I will show you.”
2. Take now thy son . Abraham is commanded to immolate his son. If God had said nothing more than that his son should die, even this message would have most grievously wounded his mind; because, whatever favor he could hope for from God, was included in this single promise, In Isaac shall thy seed be called.
Here is the trial of Abraham's faith, whether it continued so strong, so vigorous, so victorious, after a long settlement in communion with God, as it was at first, when by it he left his country: then it was made to appear that he loved God better than his father; now that he loved him better than his son. Observe here, I.
Commenting on Genesis 22:1-2
And he said, take now thy son,.... Directly, immediately; not thine ox, nor thy sheep, nor thy ram, nor thy lamb, nor thy servant, but thy son: thine only son Isaac; for, though Ishmael was his son, he was a son by his maid, by his concubine, and not by his wife; Isaac was his only legitimate son, his only son by his lawful wife...