And whosoever shall not receive you, nor hear you, when ye depart thence, shake off the dust under your feet for a testimony against them. Verily I say unto you, It shall be more tolerable for Sodom and Gomorrha in the day of judgment, than for that city.
If someone doesn't accept or listen to you when you leave, shake off the dust from your feet as a sign against them. I assure you, it will be worse for that city on Judgment Day than for Sodom and Gomorrah.