Genesis 22:12-13

12And he said, Lay not thy hand upon the lad, neither do thou any thing to him: for now I know that thou fearest God, seeing thou hast not withheld from me thy son, thy only son . 13And Abraham lifted up his eyes, and looked, and behold behind him a ram caught in a thicket by his horns: and Abraham went and took the ram, and offered him for a burnt offering in the stead of his son.