Author's Note: Genesis 22: 10-12: And Homer 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, Homer, Homer: 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.
Caravaggio's original.