1 Corinthians 16:4

16:4 And if it seems advisable that I should go also, they will go with me.

1 Corinthians 10:8

10:8 And let us not be immoral, as some of them were, and twenty-three thousand died in a single day. ¹ 

[10:8]  ¹ sn This incident is recorded in Num 25:1-9.