{12} For since by man came death, by man came also the resurrection of the dead.

(12) Another confirmation of the same conclusion: for Christ is to be considered as opposite to Adam, that as from one man Adam, sin came over all, so from one man Christ, life comes to all. That is to say, that all the faithful, who die because by nature they were born of Adam, so because in Christ they are made the children of God by grace, they are made alive and restored to life by him.

People's New Testament

15:21 Since by man came death. Man, the first man, sinned, and death came upon his race, because in him the race had sinned.

By man came also the resurrection of the dead. By Christ, the Son of Man.

Jamieson-Fausset-Brown Bible Commentary

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.

Matthew Henry's Concise Commentary

15:20-34 All that are by faith united to Christ, are by his resurrection assured of their own. As through the sin of the first Adam, all men became mortal, because all had from him the same sinful nature, so, through the resurrection of Christ, shall all who are made to partake of the Spirit, and the spiritual nature, revive, and live for ever. There will be an order in the resurrection. Christ himself has been the first-fruits; at his coming, his redeemed people will be raised before others; at the last the wicked will rise also. Then will be the end of this present state of things. Would we triumph in that solemn and important season, we must now submit to his rule, accept his salvation, and live to his glory. Then shall we rejoice in the completion of his undertaking, that God may receive the whole glory of our salvation, that we may for ever serve him, and enjoy his favour. What shall those do, who are baptized for the dead, if the dead rise not at all? Perhaps baptism is used here in a figure, for afflictions, sufferings, and martyrdom, as Mt 20:22,23. What is, or will become of those who have suffered many and great injuries, and have even lost their lives, for this doctrine of the resurrection, if the dead rise not at all? Whatever the meaning may be, doubtless the apostle's argument was understood by the Corinthians. And it is as plain to us that Christianity would be a foolish profession, if it proposed advantage to themselves by their faithfulness to God; and to have our fruit to holiness, that our end may be everlasting life. But we must not live like beasts, as we do not die like them. It must be ignorance of God that leads any to disbelieve the resurrection and future life. Those who own a God and a providence, and observe how unequal things are in the present life, how frequently the best men fare worst, cannot doubt as to an after-state, where every thing will be set to rights. Let us not be joined with ungodly men; but warn all around us, especially children and young persons, to shun them as a pestilence. Let us awake to righteousness, and not sin.