Genesis 22:9-13

They arrived at the place to which God had directed him. Abraham built an altar. He laid out the wood. Then he tied up Isaac and laid him on the wood. Abraham reached out and took the knife to kill his son. Just then an angel of GOD called to him out of Heaven, “Abraham! Abraham!” “Yes, I’m listening.” “Don’t lay a hand on that boy! Don’t touch him! Now I know how fearlessly you fear God; you didn’t hesitate to place your son, your dear son, on the altar for me.” Abraham looked up. He saw a ram caught by its horns in the thicket. Abraham took the ram and sacrificed it as a burnt offering instead of his son.