Matthew 1:20-23

20But after he had considered this, an angel of the Lord appeared to him in a dream, saying, “Joseph, descendant of David, do not be afraid to take Mary as your wife, for the Child who has been conceived in her is of the Holy Spirit.

21She will give birth to a Son, and you shall name Him Jesus (The Lord is salvation), for He will save His people from their sins.”

22All this happened in order to fulfill what the Lord had spoken through the prophet [Isaiah]:

23“Behold, the virgin shall be with child and give birth to a Son, and they shall call His name Immanuel”—which, when translated, means, “God with us.”