1-corinthians 15:18

They also which are fallen asleep - All those who, either by martyrdom or natural death, have departed in the faith of our Lord Jesus Christ, are perished; their hope was without foundation, and their faith had not reason and truth for its object. Their bodies are dissolved in the earth, finally decomposed and destroyed, notwithstanding the promise of Christ to such, that he would raise them up at the last day. See John 5:25, John 5:28, John 5:29; John 11:25, John 11:26, etc.

Then they also ... - This verse contains a statement of another consequence which must follow from the denial of the resurrection - that all Christians who had died had failed of salvation, and were destroyed.

Which are fallen asleep in Christ - Which have died as Christians; 1 Corinthians 15:6 note; 1 Thessalonians 4:15 note.

Are perished - Are destroyed; are not saved. They hoped to have been saved by the merits of the Lord Jesus; they trusted to a risen Saviour, and fixed all their hopes of heaven there; but if he did not rise, of course the whole system was delusion, and they have failed of heaven, and been destroyed. Their bodies lie in the grave, and return to their native dust without the prospect of a resurrection, and their souls are destroyed. The "argument" here is mainly an appeal to their feelings: "Can you believe it possible that the good people who have believed in the Lord Jesus are destroyed? Can you believe that your best friends, your kindred, and your fellow Christians who have died, have gone down to perdition? Can you believe that they will sink to woe with the impenitent, and the polluted, and abandoned? If you cannot, then it must follow that they are saved. And then it will follow that you "cannot" embrace a doctrine which involves this consequence."

And this argument is a sound one still. There are multitudes who are made good men by the gospel. They are holy, humble, self-denying, and prayerful friends of God. "They have become such by the belief of the death and resurrection of the Lord Jesus." Can it be believed that they will be destroyed? That they will perish with the profane, and licentious, and unprincipled? That they will go down to dwell with the polluted and the wicked? "Shall not the Judge of all the earth do right?" Genesis 18:25. If it "cannot" be so believed, then they will be saved; and "if" saved it follows that the system is true which saves them, and, of course, that the Lord Jesus rose from the dead. We may remark here, that a denial of the truth of Christianity involves the belief that its friends will perish with others; that all their hopes are vain; and that their expectations are delusive. He, therefore, who becomes an infidel "believes" that his pious friends - his sainted father, his holy mother, his lovely Christian sister or child, is deluded and deceived; that they will sink down to the grave to rise no more; that their hopes of heaven will all vanish, and that they will be destroyed with the profane, the impure, and the sensual.

And if infidelity demands "this" faith of its votaries, it is a system which strikes at the very happiness of social life, and at all our convictions of what is true and right. It is a system that is withering and blighting to the best hopes of people. "Can" it be believed that God will destroy those who are living to his honor; who are pure in heart, and lovely in life, "and who have been made such by the Christian religion?" If it cannot, then every man knows that Christianity is not false, and that infidelity is not true.

15:18 They who sleep in Christ - Who have died for him, or believing in him. Are perished - Have lost their life and being together.