Then he called his twelve disciples together, and gave them power and authority over all demons, and to cure diseases.
All Commentaries on Luke 9:1 Go To Luke 9
Ambrose of Milan
AD 397
Of what kind then he ought to be who preaches the Gospel of the kingdom of God is marked out by these Gospel precepts; that is, he must not require the supports of secular aid; and clinging wholly to faith, he must believe that the lesshe requires those things, the more they will be supplied to him.
To those also who wish it, this place admits of being explained, so as to seem only to represent a spiritual temper of mind, which appears to have castoff as it were a certain covering of the body; not only rejecting power and despising wealth, but renouncing also the delights of the flesh itself.
He pronounces it to be foreign to the character of apreacher of the heavenly kingdom to run from house to house and change the rights of inviolable hospitality; but as the grace of hospitality is supposed to be offered, so also if they are not received the dust must be shaken oil; and they are commanded to depart from the city; as it follows, And whosoever will not receive you when you go out of that city, shake off thevery dust from your feet for a testimony
Or it is a great return of hospitality which is here taught, i.e. that we should not only wish peace to our hosts, but also if any faults of earthly infirmity obscure them, they should be removed by receiving the footsteps of apostolical preaching.