12 Jesus also taught his disciples to avoid unnecessary distractions. He said: “Do not embrace anybody in greeting along the road.” (Luke 10:4) Was Jesus telling them to be cool or aloof? Not at all. In Bible times, greetings often involved much more than a simple hello. Customary greetings included various formalities and lengthy conversation. One Bible scholar states: “Salutations among the Orientals did not consist, as among us, of a slight bow, or extension of the hand, but [were] performed by many embraces, and inclinations, and even prostrations of the body on the ground. All this required much time.”
Also the Society likes to use 2 John 10, "If anyone comes to YOU and does not bring this teaching, never receive him into your homes or say a greeting to him."
Paragraph 12 is a gem. I'm going to keep this on file.