Is it correct that the Lord Jesus Christ did not complete His mission, but will complete it on the day of His rising up to life?
The work of Christ, as far as His divinity is concerned, is everlasting, eternal, and to this apply the words: ” My Father has been working until now, and I have been working. ” (John 5:17).
As for the time of His incarnation the Lord Jesus completed the work for which He had come, which was to redeem the world and to save us all from the penalty of sin, for: “the Son of Man came to seek and to save what was lost. ” (John 19:30). Concerning this mission He said on the cross: “It is finished” (John 19:30)
Christ’s work as a mediator on our behalf, however, is something constant for all time, as the apostle said (1 John 2:1).
There is another kind of work which Christ will perform at the end of time, when He comes in His second coming, which is, to judge the living and the dead, and to give to each person according to his deeds. (Matt. 24:25; Rev. 22).
Even in eternity His work will not stop…
We can never say about any period of time that ‘Christ’s mission has not been completed’, that would be an inaccurate statement, and would suggest that He had failed in some way. But we can say that he had many missions: the first was in the very beginning, ” through Him, and without Him nothing was made that was made.” (John 1:3), followed by various kinds of work, each one of which was completed fully, such as His work during the period of His incarnation on earth before the crucifixion, in teaching, guiding, making disciples, spreading the faith, and preparing the way for the concept of the cross to be accepted. It was about this that He said to the Father: “I have glorified You on the earth. I have finished the work which You have given Me to do ” (John 17:4)
After His ascension into heaven, there was another kind of work which He did, which was to send the Holy Spirit. And this happened on the day of Pentecost. (Acts 2)
As for your words, ‘when He rises up to life’. the answer to this is that the Lord Jesus Christ has already risen. He rose on the third day after His crucifixion, and all the apostles witnessed it. Besides, in His divine nature the Lord has always been alive and will never die.