The Resurrection of Christ

1 Corinthians 15:

1 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.

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,  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.  For I am the least of the apostles,
unworthy 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 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.  Whether then it was I or
they, so we preach and so you believed.

The Resurrection of the Dead

12 Now if Christ is proclaimed as raised from the dead, how
can some of you say that there is no resurrection of the
dead? But if there is no resurrection of the dead, then
not even Christ has been raised.  And if Christ has not
been raised, then our preaching is in vain and your faith is
in vain.  We are even found to be misrepresenting God,
because we testified about God that he raised Christ, whom
he did not raise if it is true that 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
futile and you are still in your sins.  Then those also
who have fallen asleep in Christ have perished.  If in
Christ we have hope in this life only, we are of all
people most to be pitied.

20 But in fact Christ has been raised from the dead, the
firstfruits of those who have fallen asleep.