It’s basically a Jewish idiom that was given new meaning by Jesus.
Jews in the time of Jesus would sometimes shake the dust off their feet when leaving a Gentile (non-Jewish) town—symbolizing that they were leaving behind impurity. Jesus flips this and tells His disciples to do the same to Jewish towns that reject the Gospel—it’s a radical statement.
Jews in the time of Jesus would sometimes shake the dust off their feet when leaving a Gentile (non-Jewish) town—symbolizing that they were leaving behind impurity. Jesus flips this and tells His disciples to do the same to Jewish towns that reject the Gospel—it’s a radical statement.