Matthew 10:11-14
  
10:11 And into whatsoever city or town ye shall enter, enquire who in it is worthy; and there abide till ye go thence.
10:12 And when ye come into an house, salute it.
10:13 And if the house be worthy, let your peace come upon it: but if it be not worthy, let your peace return to you.
10:14 And whosoever shall not receive you, nor hear your words, when ye depart out of that house or city, shake off the dust of your feet.