1 Korintus 15:2

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.

1 Korintus 15:58

15:58 So then, dear brothers and sisters, ¹  be firm. Do not be moved! Always be outstanding in the work of the Lord, knowing that your labor is not in vain in the Lord.

[15:58]  ¹ tn Grk “brothers.” See note on the phrase “brothers and sisters” in 1:10.