Matthew 1:20

But while he thought on these things--Who would not feel for him after receiving such intelligence, and before receiving any light from above? As he brooded over the matter alone, in the stillness of the night, his domestic prospects darkened and his happiness blasted for life, his mind slowly making itself up to the painful step, yet planning how to do it in the way least offensive--at the last extremity the Lord Himself interposes. behold, the angel of the Lord appeared to him in a dream, saying, Joseph thou son of David--This style of address was doubtless advisedly chosen to remind him of what all the families of David's line so early coveted, and thus it would prepare him for the marvellous announcement which was to follow. fear not to take unto thee Mary thy wife, for that which is conceived in her is of the Holy Ghost--Though a dark cloud now overhangs this relationship, it is unsullied still.

This evangelist begins with the account of Christ's parentage and birth, the ancestors from whom he descended, and the manner of his entry into the world, to make it appear that he was indeed the Messiah promised, for it was foretold that he should be the son of David, and should be born of a virgin; and that he was so is here plainly shown; for here is, I. His pedigree from Abraham in forty-two generations, three fourteens (v. 1-17). II. An account of the circumstances of his birth, so far as was requisite to show that he was born of a virgin (Mat 1:18-25). Thus methodically is the life of our blessed Saviour written, as lives should be written, for the clearer proposing of the example of them.

1:20 The angel of the Lord declared to Joseph in a dream (see 2:12-13, 19, 22) that Mary had been neither seduced nor violated; instead, the baby was conceived by the Holy Spirit (Luke 1:34-35), who often has a creative and life-generating role (Gen 1:2; Ezek 37:1-14; John 3:5-8).