In the Bible, This should be the right decision to act upon this situation:
1 Corinthians 5:11 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. 5:12 For what have I to do to judge them also that are without? do not ye judge them that are within? 5:13 But them that are without God judgeth. Therefore put away from among yourselves that wicked person.
