I hurry to point to a few things. This "shake the dust off your feet" was a directive given the early disciples in the teaching of Jesus. It is interesting to note that Paul only had one epistle and one Gospel available to him at the time of this event. James had written his epistle and Matthew had completed his gospel. So, other than a verbal "hand down," Paul would not have known to carry out this "ritual upon refusal" as it applied to the Gospel.
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