What does the Bible say about Jesus finishing His work?

In John 17:4-5, Jesus declares, 'I have glorified you on the earth: I have finished the work which you gave me to do.' This statement encapsulates the culmination of His earthly ministry, emphasizing that the great atonement was made, thereby securing salvation for all those whom the Father had given Him. Historic Reformed theology affirms that Jesus’ work was intentional and complete, bringing about redemption for His covenant people. His return to glory signifies the completion of His labor and an end to His humiliation necessary for our salvation.

Moreover, this event is pivotal as it affirms God's sovereignty in the salvation plan, where Christ triumphantly ascends not only as the victor over sin but also as the one who fully trusts in the divine purpose set forth by the Father. His ascension also marks the crucial transition where He assumes Mediatorial reign at the right hand of the Father, a truth that underscores His authority and role in the ongoing work of salvation within His church.