1 Corinthians 15:2

and by which you are being saved, if you hold firmly to the message I preached to you – unless you believed in vain.

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

by which also you are saved, if you hold fast the word which I preached to you, unless you believed in vain.

And it is this Good News that saves you if you firmly believe it––unless, of course, you believed something that was never true in the first place.

and by which your life has been saved. (I'm assuming, now, that your belief was the real thing and not a passing fancy, that you're in this for good and holding fast.)

By which you have salvation; that is to say, the form in which it was given to you, if it is fixed in your minds, and if your faith in it is not without effect.

through which also you are being saved, if you hold firmly to the message that I proclaimed to you—unless you have come to believe in vain.

by which also you are saved, if you hold fast that word which I preached to you––unless you believed in vain.

and by which you are being saved, if you hold firmly to the message I preached to you – unless you believed in vain.