How do we know Christ is foreshadowed in the Old Testament?

The unity of Scripture illustrates that the Old Testament points to Christ throughout its narrative. In Genesis 22, Isaac is presented as a type of Christ, being the 'only son' and the one whom Abraham was prepared to sacrifice in obedience to God. This mirrors the New Testament understanding of Jesus as God's only Son, who was also sacrificed for our sins (John 3:16). Furthermore, the details in this account, such as Isaac carrying the wood for his own sacrifice, resonate with Christ carrying the cross, showcasing a grand narrative that runs from the Old Testament to the New. The fulfillment of God's promise to provide a lamb is ultimately realized in Jesus, emphasizing a cohesive message celebrating God's redemptive plan across both testaments.