Genesis 22:10-13 KJV
And Abraham stretched forth his hand, and took the knife to slay his son.
And the angel of the LORD called unto him out of heaven, and said, Abraham, Abraham: and he said, Here am I.
And 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 son from me.
And 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 up for a burnt offering in the stead of his son.