The Gospel according to Matthew. His birth, the announcement.

Matthew 1:21 and she will bear a son; and you shall call his name Jesus, for it is he who will save his people from their sins. 

Matthew 1:23 

Here it says the virgin shall be with child. 

Isaiah 7:14 it says the same "behold a virgin shall be with child.…"

Isaiah 7:10–25

The Lord asked Ahaz to ask for a sign. And Ahaz refused. So the Lord told Ahaz is not enough for you to try the people now you have to try God. 

Verse 14 says therefore the Lord himself will give you a sign: behold, he virgin will be with child and bear a son, and she will call his name Emmanuel.

He will eat curds and honey at the time he knows enough to refuse evil and choose good. For before the boy will know enough to refuse evil and choose good, the land whose two kings you dread will be forsaken.

What does this mean and where is the land who's to kings you dread?

Verse 18 says the Lord will whistle for the fly that is in the remotest part of the rivers of Egypt, and for the bee that is in the land of a Assyria.