Matthew 10:14,15

Whosoever shall not receive you That is, entertain you kindly; nor, in an obedient manner, hearken to your words, when you depart, &c., shake off the dust of your feet The Jews thought the land of Israel so peculiarly holy, that when they came home from any heathen country they stopped at the borders, and shook or wiped off the dust of it from their feet, that the holy land might not be polluted with it. Therefore the action here enjoined was a lively intimation, that those Jews who had rejected the gospel were holy no longer, but were on a level with heathen and idolaters. Verily, It shall be more tolerable, &c. As if he had said, And indeed you have reason to shake off the dust of your feet in such a case, for whatever profession such Jews may make of their regard to the true God, and however they may continue to boast of their national privileges, their punishment at the day of final judgment shall not only be greater than that of the generality of Gentile sinners, but even than that of those monsters of unnatural wickedness who formerly inhabited Sodom and Gomorrah, and were consumed with fire and brimstone from heaven. For the people of those cities never sinned against such extraordinary light and such singular favours as they will do who reject the gospel now to be preached to them, with great plainness and power, by you, and attested by such miracles as I shall enable you to perform.