If there come any unto you, and bring not this doctrine, receive him not into your house, neither bid him God speed:
All Commentaries on 2 John 1:10 Go To 2 John 1
Cyprian of Carthage
AD 258
Said: John the apostle laid it down in his epistle, saying: "If any one come unto you, and have not the doctrine of Christ, receive him not into your house, and say not to him, Hail. For he that saith to him, Hail, partakes with his evil deeds."