Genesis 22:10-13

Then he reached out his hand. He picked up the knife to kill his son. But the angel of the LORD called out to him from heaven. He said, “Abraham! Abraham!” “Here I am,” Abraham replied. “Do not lay a hand on the boy,” he said. “Do not harm him. Now I know that you would do anything for God. You have not held back from me your son, your only son.” Abraham looked around. There in a bush he saw a ram caught by its horns. He went over and took the ram. He sacrificed it as a burnt offering instead of his son.