That He gave His only begotten Son:
A twig comes forth from the stem of Jesse, and a Branch from his roots shall be fruitful. The Spirit of YHWH rests upon Him: the Spirit of wisdom and understanding, the Spirit of counsel and might, the Spirit of knowledge and of the fear of the YHWH; He delights in the fear of the Lord. He shall not judge after the sight of His eyes, neither reprove after the hearing of His ears, but with righteousness shall He judge the poor, and corrects with equity the meek of the earth, and He shall strike the earth with the rod of His mouth and with the breath of His lips shall He slay the wicked. And righteousness shall be the belt of His loins and faithfulness the belt of His heart.” Is 11:1
“Behold the angel of the Lord appeared to [Joseph] in a dream, saying ‘Joseph, son of David, fear not to take to yourself Mary your wife, for that which is begotten in her is of the Holy Spirit. And she shall bring forth a son and you shall call his name Jesus for He shall save his people from their sins.” Now all this was done that it might be fulfilled which was spoken by the Lord through the prophet, saying, ‘Behold a virgin shall be with child, and shall bring forth a son, and they shall call His name Emmanuel, which being translated is ‘God with us’” Matt 1:20-21