How do we know that Jesus finished His work?

In John 17:4, Jesus proclaimed, 'I have finished the work which Thou gavest Me to do,' asserting the completion of His mission even before His crucifixion. This statement emphasizes the eternal perspective of God's plan, highlighting the significance of His redemptive work as viewed by God. The act of sitting down with His disciples during the Last Supper symbolizes not only the end of His earthly ministry but also the completion of the sacrifices demanded by the law, which He fulfilled in Himself as the perfect High Priest. This assures believers of the sufficiency of His sacrifice and the assurance of salvation through Him.