Now I make known to you, brothers, the gospel which I preached to you, which you also received, in which you also stand, by which also you are saved, if you hold fast the word which I preached to you, unless you believed in vain. For I delivered to you as of the first importance what I also received, that Christ died for our sins according to the Scriptures, and that He was buried, and that He was raised on the third day according to the Scriptures, and that He appeared to Cephas, then to the twelve. After that He appeared to more than five hundred brothers at one time, most of whom remain until now, but some have fallen asleep; then He appeared to James, then to all the apostles; and last of all, as it were to one untimely born, He appeared to me also. For I am the least of the apostles, who am not fit to be called an apostle, because I persecuted the church of God. 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. Whether then it was I or they, so we preach and so you believed.
Now if Christ is preached, that He has been raised from the dead, how do some among you say that there is no resurrection from the dead? But if there is no resurrection from the dead, not even Christ has been raised; and if Christ has not been raised, then our preaching is vain, your faith also is vain. Moreover we are even found to be false witnesses of God, because we witnessed against God that He raised Christ, whom He did not raise, if in fact the dead are not raised. For if the dead are not raised, not even Christ has been raised; and if Christ has not been raised, your faith is worthless; you are still in your sins. Then those also who have fallen asleep in Christ have perished. If we have hoped in Christ in this life only, we are of all men most to be pitied.
But now Christ has been raised from the dead, the first fruits of those who are asleep. For since by a man came death, by a man also came the resurrection of the dead. For as in Adam all die, so also in Christ all shall be made alive.
--- 1 Corinthians 15:1-22
But when this perishable will have put on the imperishable, and this mortal will have put on immortality, then will come about the saying that is written, "Death is swallowed up in victory. O death, where is your victory? O death, where is your sting?" The sting of death is sin, and the power of sin is the Law; but thanks be to God, who gives us the victory through our Lord Jesus Christ.
---1 Corinthians 15:54-57