Bible verses about "apostates" | AUV

¹¹ But I wrote to you not to associate with anyone claiming to be a [Christian] brother who is [guilty of being] sexually immoral, or greedy, or an idolater, or who speaks abusively, or a drunkard, or a swindler. Do not even eat [a social meal] with such a person.

¹⁰ If anyone comes to you [i.e., to your meetings] who does not bring this teaching [about Christ], you should not welcome him into your home or give him [any] greetings [i.e., suggesting approval or endorsement]. ¹¹ For the person who greets him [with approval] participates in his evil deeds [i.e., in his false teaching].