2 Thessalonians 3:6, 14-15

Brothers and sisters, by the authority of our Lord Jesus Christ we command you to stay away from any believer who refuses to work and does not follow the teaching we gave you.

If some people do not obey what we tell you in this letter, then take note of them. Have nothing to do with them so they will feel ashamed. But do not treat them as enemies. Warn them as fellow believers.