And behold, you will conceive in your womb and bear a son, and you shall call his name Jesus.
31. Behold, thou shalt conceive in thy womb The angel adapts his words, first to Isaiah’s prophecy, (Isaiah 7:14,) and next to other passages of the Prophets, with the view of affecting more powerfully the mind of the virgin: for such prophecies were well known and highly esteemed among the godly.
We have here notice given us of all that it was fit we should know concerning the incarnation and conception of our blessed Saviour, six months after the conception of John. The same angel, Gabriel, that was employed in making known to Zacharias God's purpose concerning his son, is employed in this also; for in this, the same glorious work of redemption, which was begun in that, is carried on.
Commenting on Luke 1:26-38
And behold thou shalt conceive in thy womb,.... Though a pure virgin, which never knew a man; and therefore, "a behold", is prefixed to it, as being what was extraordinary and wonderful; as it is also, in the prophesy of it, in Isa 7:14 to which the angel manifestly refers, and is, by Matthew cited, as accomplished hereby; see Gill on Mat 1:22, Mat 1:23.