When Abraham was about to offer up Isaac as a sacrifice to God, Isaac asked him, here is the wood and the fire for the offering, but where is the sacrifice? Abraham replied God would supply Himself, a Lamb, for the offering.
This, to the best of my knowledge is teh first prophesy of Jesus Christ being the Passover Lamb of God, long before the establishment of the Passover feast.
I am certain it is a prophesy of this because the Word does not err in regard to the content of its truth, and Abraham, after being halted by theAngel of the Lord, turned and espied a ram caught in a thicket by its horns. He immediately offered it up for his burnt offering, but it was not the Lamb of God, for that was Abraham's prophesy to be fulfilled.
Praise God, amen.