NASB 1995
I wrote you in my letter not to associate with immoral people;

American Standard Version
I wrote unto you in my epistle to have no company with fornicators;

Berean Study Bible
I wrote you in my letter not to associate with sexually immoral people.

Douay-Rheims Bible
I wrote to you in an epistle, not to keep company with fornicators.

English Revised Version
I wrote unto you in my epistle to have no company with fornicators;

King James Bible
I wrote unto you in an epistle not to company with fornicators:

World English Bible
I wrote to you in my letter to have no company with sexual sinners;

Young's Literal Translation
I did write to you in the epistle, not to keep company with whoremongers --

1 Corinthians 5:9 Additional Translations ...