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 idolator, or a railer, or a drunkard, or an extortioner; with such an one no not to eat. –1 Corinthians 5:11 (KJV)

Have nothing to do with the fruitless deeds of darkness, but rather expose them. –Ephesians 5:11 (NIV)