1 Corinthians 15:3-4, 13-14

I passed on to you what I received, of which this was most important: that Christ died for our sins, as the Scriptures say; that he was buried and was raised to life on the third day as the Scriptures say

If no one is ever raised from the dead, then Christ has not been raised. And if Christ has not been raised, then our preaching is worth nothing, and your faith is worth nothing.