Abraham built an altar, made of earth slightly put together, as God afterwards prescribed, Exodus 20:24; and bound Isaac his son, partly, because burnt-offerings were to be bound to the altar; of which See Poole on "Psalms 118:27"; partly, to represent Christ, who was bound to the cross. And that Isaac might be the more exact type of Christ, he was bound by his own consent, otherwise his age and strength seem sufficient to have made an effectual resistance. It is therefore highly reasonable to think that Abraham, having in the whole journey prepared Isaac for such a work by general but pertinent discourses, did upon the mount particularly instruct him concerning the plain and peremptory command of God, the absolute necessity of complying with it, the glorious reward of his obedience, and the dismal consequences of his disobedience; the power and faithfulness of God either to prevent the fatal blow, or to restore his life lost with infinite advantage. Upon these, and such-like reasons, doubtless he readily laid himself down at his father's feet, and yielded up himself to the Divine will.
Related Commentaries of Genesis 22:9
Genesis 22:9
9 And they came to the place which God had told him of; and Abraham built an altar there, and laid the wood in order, and bound Isaac his son, and laid him on the altar upon the wood.