"If people do not welcome you, shake the dust off your feet when you leave their town, as a testimony against them." (NIV)
And wherever they do not receive and accept and welcome you, when you leave that town shake off [even] the dust from your feet, as a testimony against them. (AMP)
And whosoever will not receive you, when ye go out of that city, shake off the very dust from your feet for a testimony against them. (KJV)