1 Corinthians 15:26-28

1Co 15:26 The last hostile thing to be eliminated will be death.
1Co 15:27 Because “God has subordinated them all under his feet.” But when it says, “subordinated them all,” it is plain that he who subordinated them all under him is excluded.
1Co 15:28 When they all have been subordinated to him, then the Son himself will also be subordinated to the one who subordinated them all to him, so that God may be all in all.

the resurrection in God’s plan

Paul argues that the resurrection is absolutely necessary because God has a plan to eliminate everything in the universe that does not conform to his holiness. He has a plan to be all in all again. Since the rebellion of Satan, and the consequent fall of humanity in Eden, God has not been all in all in his universe. He is sovereign, and in control of it all, but everything is not subordinated to his wishes. Everything does not conform to his being.

His plan to rectify that problem included sending Christ to die to reconcile those he planned to rescue through resurrection. His plan will include the eventual eradication of death — the last hostile holdout. Then, Christ will be able to hand the kingdom back to the Father, and God will be all in all again.

LORD, fulfil your plan. All creation groans in expectation of our complete redemption.