How do we know Christ's work on the cross is finished?

The assurance that Christ's work on the cross is finished is found in His declaration just before His death, 'It is finished.' This signifies the completion of the atonement for sin, fulfilling the law that no priest could achieve through repeated sacrifices. In Hebrews 10:11-14, we see that Jesus offered one sacrifice for sins forever, contrasting the continual offerings of priests. His finished work establishes that He alone satisfies God's requirements for redemption, leading believers to rest in this truth rather than relying on their own efforts for salvation.