What did the scene of Abraham laying Isaac on the altar preview?
It previewed how God the Son would react to the same situation: He gave Himself up of His own volition and became obedient to the death of the cross. The scene pictured the Son's voluntary self-giving, showing that His sacrifice would be by His own will, not by compulsion.
Les explains that the scene of Abraham laying Isaac on the altar was just a preview of how God the Son would react to the same situation. The Son gave Himself up of His own volition and became obedient to the death of the cross. This preview highlights the voluntary nature of the Son's obedience. In the surrounding passage, Les stresses that once God has elected us and we have responded, no one can lay anything to the charge of God's elect, and no one can take us out of His hand. The preview points to the Son's self-giving submission.