How do we know that Christ is the rock mentioned in Exodus?

The identification of Christ as the rock is explicitly made by the Apostle Paul in 1 Corinthians 10:4, where he states, '...and that rock was Christ.' This is significant because it connects the Old Testament event of Moses striking the rock for water with the New Testament understanding of Christ's role as Savior. The Israelites’ experience foreshadows the living waters offered by Christ through His death and resurrection, underscoring the unity of Scripture in revealing God's salvation plan through Christ—a foundational truth for the Reformed faith.