15:2a By this gospel you are saved,

You (plur.) are being saved by this gospel,
-or-
Because of this good news God saves you

15:2b if you hold firmly to the word I preached to you.

provided that you (plur.) keep the message I preached to you.
-or-
so long as you continue to rely/depend on what I taught you.

15:2c Otherwise, you have believed in vain.

If you (plur.) do not ⌊keep it⌋ you have trusted it for nothing.
-or-
If you do not ⌊trust God firmly⌋, you will receive no benefit from it.

© 1998, 2019, 2020, 2022, 2023 by SIL International®
Made available under the terms of a Creative Commons Attribution-ShareAlike 4.0 License (CC BY-SA) creativecommons.org/licenses/by-sa/4.0.
All Scripture quotations in this publication, unless otherwise indicated, are from The Holy Bible, Berean Standard Bible.
BSB is produced in cooperation with Bible Hub, Discovery Bible, OpenBible.com, and the Berean Bible Translation Committee.