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1Now I declare to you, brothers, the gospel which I preached to you, which also you received, in which you also stand, 2by which also you are saved, if you hold firmly the word which I preached to you -- unless you believed in vain. 3For I delivered to you first of all that which also I received: that Christ died for our sins according to the scriptures, 4that he was buried, that he was raised on the third day according to the Scriptures, 5and that he appeared to Cephas, then to the twelve. 6Then he appeared to over five hundred brothers at once, most of whom remain until now, but some have also fallen asleep. 7Then he appeared to James, then to all the apostles, 8and last of all, as to the child born at the wrong time, he appeared to me also. 9For I am the least of the apostles, who is not worthy to be called an apostle, because I persecuted the assembly of God. 10But by the grace of God I am what I am. His grace which was bestowed on me was not found vain, but I worked more than all of them; yet not I, but the grace of God which was with me. 11Whether then it is I or they, so we preach, and so you believed.
1 Corinthians 15:1-11 (WEB)