Genesis 22:11KJV

9And they came to the place which God had told him of; and Abraham built an altar there, and laid the wood in order, and bound Isaac his son, and laid him on the altar upon the wood.

10And Abraham stretched forth his hand, and took the knife to slay his son.

11And the angel of the LORD called unto him out of heaven, and said, Abraham, Abraham: and he said, Here I.

12And he said, Lay not thine hand upon the lad, neither do thou any thing unto him: for now I know that thou fearest God, seeing thou hast not withheld thy son, thine only from me.

13And Abraham lifted up his eyes, and looked, and behold behind a ram caught in a thicket by his horns: and Abraham went and took the ram, and offered him up for a burnt offering in the stead of his son.