Genesis 22:10-13

Then he picked up the knife to kill him. But the angel of the LORD called to him from heaven, “Abraham, Abraham!” He answered, “Yes, here I am.” “Don't hurt the boy or do anything to him,” he said. “Now I know that you honor and obey God, because you have not kept back your only son from him.” Abraham looked around and saw a ram caught in a bush by its horns. He went and got it and offered it as a burnt offering instead of his son.