Isa 7:14 Therefore the Lord Himself shall give you a sign: Behold, the young woman who is unmarried and a virgin shall conceive and bear a son, and shall call his name Immanuel [God with us].
Jesus was born of a virgin
Mat 1:20 But as he was thinking this over, behold, 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 that which is conceived in her is of (from, out of) the Holy Spirit.
Mat 1:21 She will bear a Son, and you shall call His name Jesus [the Greek form of the Hebrew Joshua, which means Savior], for He will save His people from their sins [that is, prevent them from failing and missing the true end and scope of life, which is God].
Mat 1:22 All this took place that it might be fulfilled which the Lord had spoken through the prophet,
Mat 1:23 Behold, the virgin shall become pregnant and give birth to a Son, and they shall call His name Emmanuel--which, when translated, means, God with us. [Isa. 7:14.]
Luk 1:30 And the angel said to her, Do not be afraid, Mary, for you have found grace (free, spontaneous, absolute favor and loving-kindness) with God.
Luk 1:31 And listen! You will become pregnant and will give birth to a Son, and you shall call His name Jesus.
Luk 1:32 He will be great (eminent) and will be called the Son of the Most High; and the Lord God will give to Him the throne of His forefather David,
Luk 1:33 And He will reign over the house of Jacob throughout the ages; and of His reign there will be no end. [Isa. 9:6, 7; Dan. 2:44.]
Luk 1:34 And Mary said to the angel, How can this be, since I have no [intimacy with any man as a] husband?
Luk 1:35 Then the angel said to her, The Holy Spirit will come upon you, and the power of the Most High will overshadow you [like a shining cloud]; and so the holy (pure, sinless) Thing (Offspring) which shall be born of you will be called the Son of God. [Exod. 40:34; Isa. 7:14.]