1 Corinthians 15:6, 17, 42

After that, he was seen by more than 500 of his followers at one time, most of whom are still alive, though some have died.

And if Christ has not been raised, then your faith is useless and you are still guilty of your sins.

It is the same way with the resurrection of the dead. Our earthly bodies are planted in the ground when we die, but they will be raised to live forever.