1 Corinthians 15:2

¹ Now, brothers, I want to remind you of the gospel I preached to you, which you received, and in which you stand firm.

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

³ For what I received I passed on to you as of first importance: that Christ died for our sins according to the Scriptures,

⁴ that He was buried, that He was raised on the third day according to the Scriptures,

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: By this gospel you are saved, if you hold firmly to the word I preached to you. Otherwise, you have believed in vain.
KJV: By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain.
WEB: by which also you are saved, if you hold firmly the word which I preached to you—unless you believed in vain.
ASV: by which also ye are saved, if ye hold fast the word which I preached unto you, except ye believed in vain.
DARBY: by which also ye are saved, (if ye hold fast the word which I announced to you as the glad tidings,) unless indeed ye have believed in vain.
BLB: by which you⁺ are also being saved in what word I proclaimed to you⁺, if you⁺ hold fast—unless you⁺ believed in vain.

ÅB: som dere og blir frelst ved dersom dere holder fast ved det ord hvormed jeg forkynte dere det, såfremt dere ikke forgjeves er kommet til troen.
OTB: Gjennom hvilket dere også blir frelst, hvis dere holder fast ved budskapet jeg forkynte for dere, med mindre deres tro var uten hensikt.
B1930: som I og blir frelst ved dersom I holder fast ved det ord hvormed jeg forkynte eder det, såfremt I ikke forgjeves er kommet til troen.

Hebrews 3:6
But Christ is faithful as the Son over God’s house. And we are His house, if we hold firmly to our confidence and the hope of which we boast.
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Hebrews 2:1
We must pay closer attention, therefore, to what we have heard, so that we do not drift away.
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Hebrews 3:14
We have come to share in Christ if we hold firmly to the end the assurance we had at first.
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2 Timothy 1:9
He has saved us and called us to a holy calling, not because of our works, but by His own purpose and by the grace He granted us in Christ Jesus before time began.
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1 Corinthians 1:18
For the message of the cross is foolishness to those who are perishing, but to us who are being saved it is the power of God.
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Colossians 1:23
if indeed you continue in your faith, established and firm, not moved from the hope of the gospel you heard, which has been proclaimed to every creature under heaven, and of which I, Paul, have become a servant.
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Ephesians 2:8
For it is by grace you have been saved through faith, and this not from yourselves; it is the gift of God,
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John 8:31–32
So He said to the Jews who had believed Him, “If you continue in My word, you are truly My disciples.
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