I Corinthians 15:21

by man . . . by man--The first-fruits are of the same nature as the rest of the harvest; so Christ, the bringer of life, is of the same nature as the race of men to whom He brings it; just as Adam, the bringer of death, was of the same nature as the men on whom he brought it.

In this chapter the apostle treats of that great article of Christianity - the resurrection of the dead. I. He establishes the certainty of our Saviour's resurrection (Co1 15:1-11). II. He, from this truth, sets himself to refute those who said, There is no resurrection of the dead (Co1 15:12-19). III. From our Saviour's resurrection he establishes the resurrection of the dead and confirms the Corinthians in the belief of it by some other considerations (Co1 15:20-34). IV. He answers an objection against this truth, and takes occasion thence to show what a vast change will be made in the bodies of believers at the resurrection (v. 35-50). V. He informs us what a change will be made in those who shall be living at the sound of the last trumpet, and the complete conquest the just shall then obtain over death and the grave (Co1 15:51-57). And, VI. He sums up the argument with a very serious exhortation to Christians, to be resolved and diligent in their Lord's service, because they know they shall be so gloriously rewarded by him (Co1 15:58).

15:21-23 Adam’s sin contrasts with Christ’s resurrection (cp. 15:45-49).