How do we know the Sabbath is still important for Christians?

While the literal observance of the seventh-day Sabbath as prescribed in the Old Testament is not mandated for Christians, its significance remains in its representation of spiritual rest. Hebrews 4 speaks of a spiritual rest that is available to believers through faith in Christ. Our Lord Jesus accomplished the work of redemption, paralleling God's work of creation, and just as God rested on the seventh day, Christ has entered His rest after completing the work necessary for salvation. Thus, the principle of the Sabbath—ceasing from our efforts to earn favor with God—is vital for understanding how we relate to Him through Christ.