These verses come from: I Corinthians 15: 1-11 - First Letter of Paul to the Corinthians
1 Now I make known to you, brethren, the gospel which I preached to you, which also you received, in which also you stand.
2 by which also you are saved, if you hold fast the word which 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 according to the Scriptures,
4 and that He was buried, and that He was raised on the third day according to the Scriptures,
5 and that He appeared to Cephas, then to the twelve.
6 After that He appeared to more than five hundred brethren at one time, most of whom remain until now, but some have fallen asleep;
7 then He appeared to James, then to all the apostles;
8 and last of all, as it were to one untimely born, He appeared to me also.
9 For I am the least of the apostles, who am not fit 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 did not prove vain; but I labored even more than all of them, yet not I, but the grace of God with me.
11 Whether then it was I or they, so we preach and so you believed.
The Ryrie Study Bible - New American Standard Translation