How do we know that Christ is our rest and fulfillment of the law?

The concept of Christ as our rest is rooted in Hebrews 4:9-10, which asserts that believers enter into Christ's rest by ceasing from their own works, just as God rested after creation. Furthermore, Colossians 2:17 teaches that the Sabbath and other ceremonial practices were merely shadows of Christ. In Him, believers find complete fulfillment and acceptance, as He has accomplished the work of redemption, allowing believers to rest in the assurance of their salvation rather than relying on their adherence to the law for righteousness.