1 Corinthians 15:1

Paul is showing the Corinthians that if they have been led away from his teaching, especially from belief in the resurrection of the dead on which it is based, they will lose everything they have believed.

"I make known unto you, brethren," saith he, "the gospel which I preached unto you." Seest thou with what modesty he commences? Seest thou how from the beginning he points out that he is bringing in no new nor strange thing? For he who "maketh known" that which was already known but afterwards had fallen into oblivion, "maketh known" by recalling it into memory. And when he called them "brethren," even from hence he laid the foundation of no mean part of the proof of his assertions. For by no other cause became we "brethren," but by the dispensation of Christ according to the flesh. And this is just the reason why he thus called them, at the same time soothing and courting them, and likewise reminding them of their innumerable blessings. And what comes next again is demonstrative of the same. What then is this? "The gospel." For the sum of the gospels hath its original hence, from God having become man and having been crucified and having risen again. This gospel also Gabriel preached to the Virgin, this also the prophets to the world, this also the apostles all of them. "Which I preached unto you, which also ye received, wherein also ye stand. By which also ye are saved, in what word I preached unto you; if ye hold it fast, except ye believed in vain." Seest thou how he calls themselves to be witnesses of the things spoken? And he saith not, "which ye heard," but, "which ye received," demanding it of them as a kind of deposit, and showing that not in word only, but also by deeds and signs and wonders they received it, and that they should hold it safe. Next, because he was speaking of the things long past, he referred also to the present time, saying, "wherein also ye stand," taking the vantage ground of them that disavowal might be out of their power, though they wished it never so much. […]

He passes on to the teaching about the resurrection, which constitutes the foundation of our faith. For if there is no resurrection, then Christ has not risen either; and if He has not risen, then He did not become incarnate either; and thus our entire …

Note, The doctrine of Christ's death and resurrection is at the foundation of Christianity. Remove this foundation, and the whole fabric falls, all our hopes for eternity sink at once. And it is by holding this truth firmly that Christians are made to stand in a day of trial, and kept faithful to God.

Moreover brethren, I declare unto you the Gospel,.... The apostle here passes on, and proceeds to a new subject, the doctrine of the resurrection of the dead, which some in this church denied; and which he undertakes to prove, establish, and defend; and in order to lead on to it, observes, that what he was about to declare, make known, or put them in mind of, was no other than the Gospel he had formerly preached to them, they had received, professed to stand in, and were saved by, unless their faith was in vain.