How do we know the significance of the Old Testament feasts?

The Old Testament feasts, such as those described in Leviticus 23, serve as shadowy representations of the spiritual realities found in Christ. Each feast, from Passover to the Feast of Tabernacles, outlines God's redemptive plan and teaches us about salvation through Jesus. For example, the Feast of Unleavened Bread signifies our dependence on Christ, the bread of life, and the Feast of First Fruits points to His resurrection as the guarantee of the resurrection of believers. Understanding these feasts provides insight into the continuity of God's salvation history culminating in Christ's atoning work.