Genesis 22:11-13

But the Angel of the LORD called to him from heaven and said, “Abraham, Abraham!” So he said, “Here I am.” And He said, “Do not lay your hand on the lad, or do anything to him; for now I know that you fear God, since you have not withheld your son, your only son, from Me.” Then Abraham lifted his eyes and looked, and there behind him was a ram caught in a thicket by its horns. So Abraham went and took the ram, and offered it up for a burnt offering instead of his son.