Genesis 22:10-12

And Abraham picked up the knife to kill his son as a sacrifice. At that moment the angel of the LORD called to him from heaven, “Abraham! Abraham!” “Yes,” Abraham replied. “Here I am!” “Don’t lay a hand on the boy!” the angel said. “Do not hurt him in any way, for now I know that you truly fear God. You have not withheld from me even your son, your only son.”