Charles Ellicott Commentary Genesis 22:9

"And they came to the place which God had told him of. And Abraham built the altar there, and laid the wood in order, and bound Isaac his son, and laid him on the altar, upon the wood." — Genesis 22:9 (ASV)

Abraham ... bound Isaac.—Jewish commentators agree that this was done with Isaac’s consent, nor could it well have been otherwise. Thus his youthful faith was tried equally with that of his father, his future life sanctified, and himself ennobled by being made a type of Christ (1 Peter 2:23).