1 Corinthians 15:13

But by the grace of God I am what I am. His grace which was given to me was not futile, but I worked more than all of them; yet not I, but the grace of God which was with me.

Whether then it is 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 of the dead?

If Christ has not been raised, then our preaching is in vain and your faith also is in vain.

Yes, we are also found false witnesses of God, because we testified about God that he raised up Christ, whom he didn’t raise up if it is true that the dead are not raised.

For if the dead aren’t raised, neither has Christ been raised.