How do we know that Christ is the mercy seat?

In Romans 3:25, Christ is described as the propitiation, which translates to mercy seat. This term connects Him directly to the sacrificial system established in the Old Testament. The mercy seat was where God met with His people, and through His sinless life and atoning death, Jesus satisfies the justice of God on behalf of the elect. He is the fulfillment of the law and the ultimate sacrifice that allows believers access to God's grace and mercy, demonstrating that acceptance before God is rooted in Christ alone.