Hilary of Poitiers
Catena Aurea · Matthäusevangelium 10
And into whatsoever city or town ye shall enter, enquire who in it is worthy; and there abide till ye go thence. And when ye come into an house, salute it. And if the house be worthy, let your peace eome upon it: but if it be not worthy, let your peace return to you. And whosoever shall not receive you, nor hear your words, when ye depart out of that house or eity, 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.
The Apostles salute the house with the prayer of peace; yet so as that peace seems rather spoken than given. For their own peace which was the bowels of their pity ought not to rest upon the house if it were not worthy; then the sacrament of heavenly peace could be kept within the Apostles own bosom. Upon such as rejected the precepts of the heavenly kingdom an eternal curse is left by the departure of the Apostles, and the dust shaken from their feet; And whosoever shall not receive you, nor hear your words, when ye go out of that house, or that town, cast the dust off your feet. For he that lives in any place seems to have a kind of fellowship with that place. By the casting the dust off the feet therefore all that belonged to that house is left behind, and nothing of healing or soundness is borrowed from the footsteps of the Apostles having trod their soil.