For if the dead do not rise, then Christ is not risen.
1 Corinthians 15:16
Surrounding context
15:15 Yes, and we are found false witnesses of God, because we have testified of God that He raised up Christ, whom He did not raise up--if in fact the dead do not rise.
15:16 For if the dead do not rise, then Christ is not risen.
15:17 And if Christ is not risen, your faith is futile; you are still in your sins!