New Revised Standard Version
I wrote to you in my letter not to associate with sexually immoral persons—

Contemporary English Version
In my other letter I told you not to have anything to do with immoral people.

New American Bible
I wrote you in my letter not to associate with immoral people,

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

I wrote to you in an epistle, not to keep company with fornicators.

not.

1 Corinthians 5:2,7 And you are puffed up and have not rather mourned: that he might be taken away from among you that hath done this thing. . . .

Psalm 1:1,2 Blessed is the man who hath not walked in the counsel of the ungodly, nor stood in the way of sinners, nor sat in the chair of pestilence: . . .

Proverbs 9:6 He that teacheth a scorner, doth an injury to himself; and he that rebuketh a wicked man, getteth himself a blot.

2 Corinthians 6:14,17 Bear not the yoke with unbelievers. For what participation hath justice with injustice? Or what fellowship hath light with darkness? . . .

Ephesians 5:11 And have no fellowship with the unfruitful works of darkness: but rather reprove them.

2 Thessalonians 3:14 And if any man obey not our word by this epistle, note that man and do not keep company with him, that he may be ashamed.