Bede the Venerable
Catena Aurea · Lukasevangelium 10
And into whatever house ye enter, first say, Peace be to this house. And if the son of peace be there, your peace shall rest upon it: if not, it shall turn to you again. And in the same house remain, eating and drinking such things as they give; for the labourer s worthy of his hire. Go not from house to house. And into whatsoever city ye enter, and they receive you, eat such things as are set before you: And heal the sick that are therein, and say unto them, The kingdom of God is come nigh unto you. But into whatsoever city ye enter, and they receive you not, go your ways out into the streets of the same, and say, Even the very dust of your city, which cleaveth on us, we do wipe off against you: notwithstanding be ye sure of this, that the kingdom of God is come nigh unto you. But I say unto you, that it shall be more tolerable in that day for Sodom, than for that city.
Either as a testimony to the earthly toil which they had in vain undergone for them, or to shew that so far from seeking any thing earthly from them, they suffer not even the dust from their land to cleave to them. Or by the feet is meant the very labour and walking to and fro of preaching; but the dust with which they are sprinkled is the lightness of worldly thoughts, from which even the greatest teachers cannot be free. Those then who have despised the teaching, turn the labours and dangers of the teachers into a testimony of their condemnation.