The ram clearly being a shadow of Christ who was to come, finds us tied upon the altar of the wrath of God. We were bound in the sense that we loved our sin and wanted to continue in it. As it is with all those who are under the law, the dagger of God’s justice was raised above us, waiting until His sovereign and unstoppable hand plunged it down. Yet while we were still sinners, fighting against His authority and grace, He began to untie us.
As Isaac watched the knife which was lifted by his father be plunged into the ram that had been caught in the thicket, what could have been going through his mind? As he watched as the altar was set ablaze to finish the burnt offering, the thought of his replacement must have astonished him.
Only moments early Issac had been bound and laying on the altar. Not only him but the future existence of the children of God. As he watched his replacement, he watched for us all as God shows him that there is one who will come to bear our scorn.