Now we command you, brothers, in the name of our Lord Jesus Christ, that you withdraw yourselves from every brother who walks in rebellion, and not after the tradition which they received from us.

 Paul disliked the busybody intensely. There may be greater sins than gossip but there is none which does more damage in the Church. A man who is doing his own work with his whole strength will have enough to do without being maliciously interested in the affairs of others. 