Genesis 22:11-13

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.” Then Abraham looked up and saw a ram caught by its horns in a thicket. So he took the ram and sacrificed it as a burnt offering in place of his son.