'Company' in the Bible

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

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.

Do we not have the right to the company of a believing wife, like the other apostles and the Lord's brothers and Cephas?

Do not be deceived: “Bad company corrupts good morals.”