1 Corinthians 15:2

By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.
— 1 Corinthians 15:2, King James Version

In other translations

World English Bible (WEB)

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

American Standard Version (ASV)

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

Young's Literal Translation (YLT)

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,