V8-5 [8-11] The Twelve have received their own call and mission through God's gift,
And the benefits they confer are likewise to be given freely. They are not to take with them money,
Matt  The greeting of peace is conceived of not merely as a salutation but as an effective word. If it finds no worthy recipient, it will return to the speaker.
7  Shake the dust from your feet: this gesture indicates a complete disassociation from such unbelievers.
8  The persecutions attendant upon the post-resurrection mission now begin to be spoken of. Here Matthew brings into the discourse sayings found in Mark 13 which deals with events preceding the parousia.
10  To the end: the original meaning was probably "until the parousia." But it is not likely that Matthew expected no missionary disciples to suffer death before then, since he envisages the martyrdom of other Christians (Matthew 10:21). For him, the end is probably that of the individual's life (see Matthew 10:28).
11  Before the Son of Man comes: since the
coming of the Son of Man at the end of the age had not taken place when this
gospel was written, much less during the mission of the Twelve during Jesus'
ministry, Matthew cannot have meant the coming to refer to the parousia. It is difficult to know what he understood it to
be: perhaps the "proleptic parousia"
28:16-20, or the destruction of the temple in A.D. 70, viewed as a coming
of Jesus in judgment on unbelieving
12  Beelzebul: see Matthew 9:34 for the charge linking Jesus with "the prince of demons," who is named Beelzebul in Matthew 12:24. The meaning of the name is uncertain; possibly, "lord of the house."
13  The concealed and secret coming of the kingdom is to be proclaimed by them, and no fear must be allowed to deter them from that proclamation.
14 [32-33] In the Q parallel (Luke 12:8-9), the Son of Man will acknowledge those who have acknowledged Jesus, and those who deny him will be denied (by the Son of Man) before the angels of God at the judgment. Here Jesus and the Son of Man are identified, and the acknowledgment or denial will be before his heavenly Father.
15  The first mention of the cross in Matthew, explicitly that of the disciple, but implicitly that of Jesus (and follow after me). Crucifixion was a form of capital punishment used by the Romans for offenders who were not Roman citizens.
16  One who denies Jesus in order to save one's earthly life will be condemned to everlasting destruction; loss of earthly life for Jesus' sake will be rewarded by everlasting life in the kingdom.
18  A prophet: one who speaks in the name of God; here, the Christian prophets who proclaim the gospel. Righteous man: since righteousness is demanded of all the disciples, it is difficult to take the righteous man of this verse and one of these little ones (Matthew 10:42) as indicating different groups within the followers of Jesus. Probably all three designations are used here of Christian missionaries as such.