1 Corinthians 15:12-16

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?

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, your faith also is in vain.

Moreover, we are even found to be false witnesses of God, because we testified 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, then not even Christ has been raised;