3 Bible Verses about Warnings Of Evil Associations

I wrote to you in an epistle, not to associate with whoremongers:

Be not unsuitably connected with infidels: for what fellowship hath righteousness with unrighteousness? or what communion hath light with darkness?

But now I have written to you, not to associate with him, if any one, that is called a brother, be a whoremonger, or covetous, or an idolater, or a railer, or a drunkard, or rapacious; with such a one no not to eat.