1 Corinthians 15:14

And if Christ be not risen, then is our preaching vain, and your faith is also vain.

Cross-reference

1 Corinthians 15:2 warns of believing 'in vain'; this verse shows that a resurrection-less faith is exactly that.

Acts 17:31 Contrast

Acts 17:31 affirms the resurrection as God's proof—opposite to Paul's hypothetical 'if not raised.'

Acts 25:19 Historical context

Acts 25:19 records Paul's claim that Jesus is alive – the very premise Paul says makes faith not useless.

Romans 10:9 Parallel

Romans 10:9 ties salvation to belief in the resurrection – the same foundation Paul argues is essential for faith.

Galatians 2:21 uses the same 'if...then useless' logic about Christ's death – mirroring Paul's argument about the resurrection.