keep in memory what I preached unto you

1Co 15:1 Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand; 1Co 15:2 By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain. 1Co 15:3 For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures; 1Co 15:4 And that he was buried, and that he rose again the third day according to the scriptures: