1 Corinthians 15:13-15

13 If there's no resurrection of the dead then Christ hasn't been raised either.

14 And if Christ isn't raised, then our message we shared with you is pointless, and your trust in God is pointless too.

15 In addition, we would be shown to be false witnesses of God when we testified that God raised Christ from the dead. But God didn't raise Christ from the dead if it's true that there's no resurrection.