when they were departed] Not presently, but some time after, for Joseph and Mary were at Jerusalem after this, before they went into Egypt, Luke 2. 22.
appeareth to Joseph] Very likely at Jerusalem, and so Joseph went thence into Egypt, for his abiding at Nazareth mentioned, Luke 2:39-40. was for a long time, till Christ grew great, and therefore could not be before his going into Egypt.
flee] Because the time of his death was not yet come, but our Saviour must live to preach, and do many miracles first. This flight was part of Christs humiliation.
into Egypt] Far out of Herods reach. See the like, 1 Kings 11:40.
till I bring thee word] This shews, that God would take care to provide for them there, and to bring them back again.