As for a person who stirs up division, after warning him once and then twice, have nothing more to do with him.
Gossip is very divisive and can damage a person’s good reputation. If you know someone who constantly gossips, take courage and confront the person. This is difficult to do, but if you take a kind and loving approach, perhaps the person will realize how much damage has been done. If your advice goes unheeded, then it may be best to avoid that person or end the friendship.