What is the purpose of the virgin birth?
Isaiah 7:14
Therefore, the Lord will give you a sign. The young woman is pregnant and is about to give birth to a son, and she will name him Immanuel.
Matthew 1:18-25
This is how the birth of Jesus Christ took place. When Mary his mother was engaged to Joseph, before they were married, she became pregnant by the Holy Spirit. 19 Joseph her husband was a righteous man. Because he didn’t want to humiliate her, he decided to call off their engagement quietly. 20 As he was thinking about this, an angel from the Lord appeared to him in a dream and said, “Joseph son of David, don’t be afraid to take Mary as your wife, because the child she carries was conceived by the Holy Spirit. 21 She will give birth to a son, and you will call him Jesus, because he will save his people from their sins.” 22 Now all of this took place so that what the Lord had spoken through the prophet would be fulfilled:
23 Look! A virgin will become pregnant and give birth to a son,
And they will call him, Emmanuel.[a]
(Emmanuel means “God with us.”)
24 When Joseph woke up, he did just as an angel from God commanded and took Mary as his wife. 25 But he didn’t have sexual relations with her until she gave birth to a son. Joseph called him Jesus.
Luke 1:5-38
During the rule of King Herod of Judea there was a priest named Zechariah who belonged to the priestly division of Abijah. His wife Elizabeth was a descendant of Aaron. 6 They were both righteous before God, blameless in their observance of all the Lord’s commandments and regulations. 7 They had no children because Elizabeth was unable to become pregnant and they both were very old. 8 One day Zechariah was serving as a priest before God because his priestly division was on duty. 9 Following the customs of priestly service, he was chosen by lottery to go into the Lord’s sanctuary and burn incense. 10 All the people who gathered to worship were praying outside during this hour of incense offering. 11 An angel from the Lord appeared to him, standing to the right of the altar of incense. 12 When Zechariah saw the angel, he was startled and overcome with fear. 13 The angel said, “Don’t be afraid, Zechariah. Your prayers have been heard. Your wife Elizabeth will give birth to your son and you must name him John. 14 He will be a joy and delight to you, and many people will rejoice at his birth, 15 for he will be great in the Lord’s eyes. He must not drink wine and liquor. He will be filled with the Holy Spirit even before his birth. 16 He will bring many Israelites back to the Lord their God. 17 He will go forth before the Lord, equipped with the spirit and power of Elijah. He will turn the hearts of fathers[a] back to their children, and he will turn the disobedient to righteous patterns of thinking. He will make ready a people prepared for the Lord.” 18 Zechariah said to the angel, “How can I be sure of this? My wife and I are very old.” 19 The angel replied, “I am Gabriel. I stand in God’s presence. I was sent to speak to you and to bring this good news to you. 20 Know this: What I have spoken will come true at the proper time. But because you didn’t believe, you will remain silent, unable to speak until the day when these things happen.” 21 Meanwhile, the people were waiting for Zechariah, and they wondered why he was in the sanctuary for such a long time. 22 When he came out, he was unable to speak to them. They realized he had seen a vision in the temple, for he gestured to them and couldn’t speak. 23 When he completed the days of his priestly service, he returned home. 24 Afterward, his wife Elizabeth became pregnant. She kept to herself for five months, saying, 25 “This is the Lord’s doing. He has shown his favor to me by removing my disgrace among other people.”
Jesus’ birth foretold
26 When Elizabeth was six months pregnant, God sent the angel Gabriel to Nazareth, a city in Galilee, 27 to a virgin who was engaged to a man named Joseph, a descendant of David’s house. The virgin’s name was Mary. 28 When the angel came to her, he said, “Rejoice, favored one! The Lord is with you!” 29 She was confused by these words and wondered what kind of greeting this might be. 30 The angel said, “Don’t be afraid, Mary. God is honoring you. 31 Look! You will conceive and give birth to a son, and you will name him Jesus. 32 He will be great and he will be called the Son of the Most High. The Lord God will give him the throne of David his father. 33 He will rule over Jacob’s house forever, and there will be no end to his kingdom.” 34 Then Mary said to the angel, “How will this happen since I haven’t had sexual relations with a man?” 35 The angel replied, “The Holy Spirit will come over you and the power of the Most High will overshadow you. Therefore, the one who is to be born will be holy. He will be called God’s Son. 36 Look, even in her old age, your relative Elizabeth has conceived a son. This woman who was labeled ‘unable to conceive’ is now six months pregnant.37 Nothing is impossible for God.” 38 Then Mary said, “I am the Lord’s servant. Let it be with me just as you have said.” Then the angel left her.