Genesis 22, Caravaggio, and the Ram

Belatedly, I write to reflect further on Carl Trueman's Counterpoint ("Close, but No Cigar").  There Carl writes about his recent visit to a synagogue and the rabbi's thoughtful homily on Genesis 22, which included everything except the gospel.

As I read Carl's article -- and as I write this post -- I have before me a reproduction of Caravaggio's "The Sacrifice of Isaac."  The friend who gave me the picture was kind enough to put a description of the painting on the back.  It too, is close, but no cigar:

"In 1603 Caravaggio painted this for Cardinal maffeo Barberini, the future Pope Urban VIII. Old Abraham is intercepted in the act of slitting his son's throat by an admonishing angel who with his right hand prevents the murder and with his left points to the substitute victim. Light directs the viewer to scan the scene from left to right as it picks out the angel's shoulder and left hand, the quizzical face of Abraham, the right shoulder and terrified face of Isaac and finally the docile ram."