Matthew 10:14
And if anyone will not receive you or listen to your words, shake off the dust from your feet when you leave that house or town. The dust-shaking is a gesture of prophetic judgment and personal disassociation: the Jewish practice of shaking off Gentile dust when leaving Gentile territory is here applied to the towns and households of Israel that reject the kingdom's messengers. Acts 13:51 records Paul and Barnabas shaking dust from their feet in Pisidian Antioch after the Jewish leadership rejected their message. The gesture is not contempt but judgment — the messengers have done their part; the rejection is the town's or household's responsibility.