1 Corinthians 15:2

15:2 and by which you are being saved, if you hold firmly to the message I preached to you – unless you believed in vain.

1 Corinthians 15:14

15:14 And if Christ has not been raised, then our preaching is futile and your faith is empty.

1 Corinthians 15:17

15:17 And if Christ has not been raised, your faith is useless; you are still in your sins.