a dream: what a person sees while asleep, and in Matthew always the channel God uses to deliver a message or warning
This is the ordinary Greek word for a dream, but in the New Testament it turns up only six times, all in Matthew, and always inside the set phrase "in a dream." Five of the six occur in the birth stories: God tells Joseph in a dream to take Mary as his wife, warns the wise men not to return to Herod, sends Joseph to Egypt and later home again, and finally steers the family to Nazareth. The sixth comes at Jesus' trial, where Pilate's wife has suffered over Jesus in a dream and sends word that he is innocent.
Every one of these is a revelatory dream, not the stray imagery of ordinary sleep. It is the door through which God announces what he is about to do, and in each case the sleeper wakes and acts on it. The dream is not itself the point; its fulfillment in waking life is. That old contrast between the dream at night and its coming true by day runs quietly under all six scenes.
Matthew's choice of word is pointed. The Greek Old Testament had used a different word for the famous dreams of Jacob, Joseph, and Daniel, but Matthew reaches instead for the everyday term of his own day, one that carried a strong sense of a message about the future. Through this small, common word he tells his readers that God has been guiding events from the very start.
Disputed
Whether Matthew's choice of ὄναρ over the Septuagint's ἐνύπνιον carries a technical, future-oriented nuance marking these as predictive dreams, or is simply the ordinary Koine idiom of his day.
- majorityThe phrase κατ' ὄναρ was just coming into vogue in the imperial East and carries no technical predictive force; ancient authors use the several dream-words interchangeably, and the supposed ὄναρ/ἐνύπνιον distinction is not generally observed.; Liddell-Scott-Jones, A Greek-English Lexicon, s.v. ὄναρ; W. V. Harris, Dreams and Experience in Classical Antiquity (2009)
- minorityMatthew deliberately chose ὄναρ to signal a future-oriented, prophetic dream, ruling out any merely physiological reading, along the lines of the distinction Artemidorus later drew.; W. Subash, The Dreams of Matthew 1:18-2:23 (Peter Lang, 2012)