1 Corinthians 15:1-11 (ESV)

15 Now I would remind you, brothers,^[a] of the gospel I preached to you, which you received, in which you stand, ² and by which you are being saved, if you hold fast to the word I preached to you—unless you believed in vain.

³ For I delivered to you as of first importance what I also received: that Christ died for our sins in accordance with the Scriptures, ⁴ that he was buried, that he was raised on the third day in accordance with the Scriptures, ⁵ and that he appeared to Cephas, then to the twelve. ⁶ Then he appeared to more than five hundred brothers at one time, most of whom are still alive, though some have fallen asleep.⁷ Then he appeared to James, then to all the apostles. ⁸ Last of all, as to one untimely born, he appeared also to me. ⁹ For I am the least of the apostles, unworthy to be called an apostle, because I persecuted the church of God. ¹⁰ But by the grace of God I am what I am, and his grace toward me was not in vain. On the contrary, I worked harder than any of them, though it was not I, but the grace of God that is with me. ¹¹ Whether then it was I or they, so we preach and so you believed.