What does the Bible say about the Old and New Covenant?

The Bible describes a clear distinction between the Old Covenant, which calls for obedience to the law, and the New Covenant, established by Christ. In the Old Covenant, people were required to keep the law to maintain fellowship with God. This covenant, often termed a 'covenant of works,' could not redeem humanity due to its inability to provide righteousness. On the other hand, the New Covenant signifies a shift where God requires no further sacrifices or obedience to attain salvation; it is all based on Christ's finished work. Christ fulfilled the law completely, thereby bringing an end to the demands of the Old Covenant and establishing grace as the new basis for believers' relationship with God.