Shaking the dust off the feet is the gesture Christ commanded His apostles to perform in towns that refused them: "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" (Matthew 10:14-15; Mark 6:11; Luke 9:5; 10:11). It was a public, unmistakable sign that the messengers had finished their errand and the responsibility now lay on the unbelieving city — a Jewish gesture against pagan territory now reversed against unrepentant Jews. Paul and Barnabas did it at Antioch of Pisidia (Acts 13:51). Evangelism has an end; rejection has a verdict.
(Composite.) The act of shaking dust from one's sandals as a testimony against an unrepentant town.
Webster: shake — “to agitate; to cause to move with quick, vibratory motion.”
In ancient Jewish practice, returning travelers shook off Gentile dust as a ritual of separation; Christ turns the gesture into a public testimony against any town — Jewish or Gentile — that refused His messengers.
Matthew 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."
Mark 6:11 — "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."
Luke 9:5 — "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."
Acts 13:51 — "But they shook off the dust of their feet against them, and came unto Iconium."
Modern evangelism is allergic to the dust-shaking gesture; we rebrand and re-target rather than mark a town as having refused. Christ commanded otherwise.
Christ's gesture is sober. It is not vindictive — the apostles do not curse the town; they simply mark it. The dust on their sandals belongs to a place that refused the message; the message moves on, the responsibility stays.
The household and the missionary still need the discipline. Not every town will receive every messenger; there is a time to leave the dust and walk on. The gesture is part of pastoral honesty about responsibility.
Greek has a specific compound verb for shaking off.
G1621 — ἐκτινάσσω (ektinassō) — to shake off, especially dust from the feet or garments (Acts 13:51; 18:6).
Note: Acts 18:6 has Paul shake out his garment with similar significance against the resistant Corinthian Jews.
"Some towns get the gospel; some towns get the dust shaken off."
"Christ commanded the gesture; do not be more genteel than your Master."
"The dust on the apostles' sandals was a testimony, not a tantrum."