1 Corinthians 15:13-15

For if there is no such thing as a resurrection from the dead, then not even Christ has been raised. And if Christ has not been raised, all of our preaching has been for nothing and your faith is useless. Moreover, if the dead are not raised, that would mean that we are false witnesses who are misrepresenting God. And that would mean that we have preached a lie, stating that God raised him from the dead, if in reality he didn’t.