What does the Bible say about the finished work of Christ?

According to Scripture, specifically found in John 19:30, Jesus proclaimed 'It is finished' as He completed the work given to Him by His Father. This declaration signifies the fulfillment of various aspects of salvation—He redeemed His people from their sins, fulfilled the law's requirements, made an end of sin for those He represented, and bore the curse of sin. The completion of His work means that nothing can be added to it for our salvation, and His redemptive act ceases the need for further sacrifices as He is the ultimate sacrifice that perfects forever those who are sanctified.