Abraham took his son to Mt. Moriah to offer a sacrifice.  He took almost everything they needed.

But Isaac spoke to Abraham his father and said, ‘My father!’
And he said, ‘Here I am, my son.’
Then he said, ‘Look, the fire and the wood, but where is the lamb for a burnt offering?’
And Abraham said, ‘My son, God will provide for Himself the lamb for a burnt offering.’ So the two of them went together.”  – Genesis 22:7-8 (NKJV)

Roughly 2000 years later and 2000 years ago, John the Baptist gave the final answer to Isaac’s question. 

… John saw Jesus coming toward him, and said, ‘Behold! The Lamb of God who takes away the sin of the world!'” – John 1:29 (NKJV)

• A lot of lambs were killed for a lot of Passovers, but there is only one Jesus.  
• Some sacrifices were offered for individuals, others for the nation; Jesus died for the sin of the world.
• Animal sacrifices were meaningful, but that meaning was symbolic.

For it is not possible that the blood of bulls and goats could take away sins.” – Hebrews 10:4 (NKJV)

• In Christ’s case all symbolism is removed as the reality of what He has done becomes evident.

Not with the blood of goats and calves, but with His own blood He entered the Most Holy Place once for all, having obtained eternal redemption.” – Hebrews 9:12 (NKJV)

Back to Mt. Moriah, roughly 2000 years later and 2000 years ago: So where is the lamb?  There He is, the Lamb of God.  Behold, the Lamb.