1 Corinthians 15:6, 17, 42

After that, Jesus was seen by more than five hundred of the believers at the same time. Most of them are still living today, but some have died.

And if Christ has not been raised, then your faith has nothing to it; you are still guilty of your sins.

It is the same with the dead who are raised to life. The body that is “planted” will ruin and decay, but it is raised to a life that cannot be destroyed.