Sacrifice of Isaac
"And the angel of Jehovah called unto him out of heaven, and said, Abraham, Abraham. And he said, Here I am. And he said, Lay not thy hand upon the lad, neither do thou anything unto him. For now I know that thou fearest God, seeing thou hast not withheld thy son, thine only son, from me." Genesis 22:11-12
The angel of the Lord halts the sacrifice of Isaac and provides a ram in his place.