Abraham is asked to sacrifice his son, his only son, as a burnt offering. And by faith, Abraham is willing to offer up the child of promise. Ultimately, we see that God did not actually want Abraham to go through with the offering, but God wanted to see that he trusted the promise.

In the Big Picture, it is God, himself, who will offer up His Son, His only begotten Son, upon the cross as a sacrifice for the whole world. Isaac points forward to Christ as the child of promise foreshadowing the fulfillment of the promise.

God so loved the world that He gave His only begotten Son!