1 Corinthians 15:2 and you have been saved by it also, if you hold on to it firmly i.e., continue believing and practicing it. For if you do not hold on to it firmly, you will have believed it all for nothing.

AUV⁽ⁱ⁾ ² [and] you have been saved by it also, if you hold on to it firmly [i.e., continue believing and practicing it]. For if you do not [hold on to it firmly], you will have believed [it] all for nothing.