Perhaps more than any other place in Scripture, 1 Corinthians 15:1-8 provides a ‘definition’ of the gospel. He writes,
Now I would remind you, brothers, of the gospel I preached to you, which you received, in which you stand, and by which you are being saved, if you hold fast to the word I preached to you—unless you believed in vain.
For I delivered to you as of first importance what I also received: that Christ died for our sins in accordance with the Scriptures, that he was buried, that he was raised on the third day in accordance with the Scriptures, and that he appeared to Cephas, then to the twelve.Then he appeared to more than five hundred brothers at one time, most of whom are still alive, though some have fallen asleep. Then he appeared to James, then to all the apostles. Last of all, as to one untimely born, he appeared also to me.
As Paul closes out his first letter to the church at Corinth, he reminds those who have received the gospel to continue to stand in the gospel. But even more than reminding them of the gospel that they know, he reiterates the four main events of the gospel–Christ’s death, burial, resurrection, and glorious appearing—so that they (and we) will might delight in the feast of knowing the triune God.
Soli Deo Gloria, dss