This verse properly belongs to the preceding chapter, from which it should on no account be separated; as with that it has the strictest connection, but with this it has none.
To teach and to preach - To teach, to give private instructions to as many as came unto him; and to preach, to proclaim publicly, that the kingdom of God is at hand; two grand parts of the duty of a Gospel minister.
Their cities - The cities of the Jews.
And it came to pass - The directions to the apostles were given in the vicinity of Capernaum. The Saviour went from thence to preach in their cities; that is, in the cities in the vicinity of Capernaum, or in Galilee. He did not yet go into Judea.