indirect
points forward to · the only son on the mountain
Abraham carries wood up a mountain with his only son, and tells Isaac that God will provide the lamb. At the cross the pattern completes in reverse: this time the Father does not withhold his Son, and the substitute God provides is himself.
indirect
points forward to · God provides the substitute
In both scenes God supplies what the human cannot: a covering in Eden, a ram in the thicket on Moriah.