1 Corinthians 15:12-14

Now if Christ is preached as raised from the dead, how is it that some among you say that there is no resurrection of the dead? But if there is no resurrection of the dead, then not even Christ has been raised; and if Christ has not been raised, then our preaching is vain [useless, amounting to nothing], and your faith is also vain [imaginary, unfounded, devoid of value and benefit—not based on truth].