1 Corinthians 15 1-3

Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand;

By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.

For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures;