New Living Translation
It is this Good News that saves you if you continue to believe the message I told you—unless, of course, you believed something that was never true in the first place.

American Standard Version
by which also ye are saved, if ye hold fast the word which I preached unto you, except ye believed in vain.

Berean Study Bible
By this gospel you are saved, if you hold firmly to the word I preached to you. Otherwise, you have believed in vain.

Douay-Rheims Bible
By which also you are saved, if you hold fast after what manner I preached unto you, unless you have believed in vain.

English Revised Version
by which also ye are saved; I make known, I say, in what words I preached it unto you, if ye hold it fast, except ye believed in vain.

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

World English Bible
by which also you are saved, if you hold firmly the word which I preached to you--unless you believed in vain.

Young's Literal Translation
through which also ye are being saved, in what words I proclaimed good news to you, if ye hold fast, except ye did believe in vain,

1 Corinthians 15:2 Additional Translations ...