KJV:
I wrote unto you in an epistle not to company with fornicators:
NASB:
I wrote you in my letter not to associate with immoral people;
KJV:
But now I have written unto you not to keep company, if any man that is called a brother be a fornicator, or covetous, or an idolater, or a railer, or a drunkard, or an extortioner; with such an one no not to eat.
NASB:
But actually, I wrote to you not to associate with any so-called brother if he is an immoral person, or covetous, or an idolater, or a reviler, or a drunkard, or a swindler-- not even to eat with such a one.