Matthew 10:12-16

And when ye come into an house, salute it.

And if the house be worthy, let your peace come upon it: but if it be not worthy, let your peace return to you.

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.

Verily I say unto you, It shall be more tolerable for the land of Sodom and Gomorrha in the day of judgment, than for that city.

Behold, I send you forth as sheep in the midst of wolves: be ye therefore wise as serpents, and harmless as doves.