Genesis 22:12-13

12And he said, Stretch not out thy hand against the lad, neither do anything to him; for now I know that thou fearest 1God, and hast not withheld thy son, thine only [son], from me.

13And Abraham lifted up his eyes, and looked, and behold, behind was a ram caught in the thicket by its horns; and Abraham went and took the ram, and offered it up for a burnt-offering instead of his son.