And so was fulfilled what the Lord had said through the prophet...
Jesus is the fulfillment of God's promise to us. No need to doubt.
There are about three hundred and thirty Old Testament predictions concerning the Messiah, the King of the Jews. Matthew continues to give evidence that Jesus is that Messiah and King. He gives evidence of Jesus' genealogy in chapter one and now he makes the case that the king-makers of the East have come and proclaimed him King of the Jews. As if that is not enough now Matthew begins to point out the prophecies that are being fulfilled in Jesus. Just in Jesus' birth and infancy he can point to four prophecies being fulfilled. Jesus, by the way, fulfilled all the Old Testament prophecies. There is no reasonable possibility that even those four could have been fulfilled accidentally, much less the three hundred odd others.
There is no coincidence or accident about this - the prophecies are fulfilled because Jesus is the fulfillment of the plan of God. He is the One spoken of by the prophets of the Old Testament, their words given to them by God Himself. It is why we can believe with great conviction that Jesus is the Son of God, come to set us free and redeem us from the curse of sin, death and hell. That is cause for great celebration today.
Merry Christmas! God has come near!