“Look!” The Greek word is idou (#2400 ἰδού), and it is used to get our attention. See commentary on Matthew 1:20 (“Look!).
“conceive in your womb.” The translation is correct, even though the Greek phrase sullēmpsē en gastri (συλλήμψῃ ἐν γαστρὶ) can also be understood as an idiom and translated “become pregnant in your womb.” Genuine conception did occur in Mary. We know from many verses of Scripture that Mary had to contribute the egg and God fertilized the egg. There is no indication in Scripture that when Jesus was said to be of the line of David, that it just meant he was adopted into that line. To fulfill the prophecies Jesus had to be born as a true descendant of David. Mary was not a surrogate mother, she was a real mother who made a real genetic contribution to Jesus Christ.
The prophecies were that Jesus was going to be a true lineal descendant of David. He was known as the “Son of David,” a title he recognized of himself, because he was a true descendant of David. Also, Psalm 132:11 says, “Yahweh swore an oath to David, a sure oath he will not revoke: “One of the fruit of your body I will place on your throne.” To fulfill that prophecy Jesus Christ had to be a genuine descendant of David, and he was not David’s descendant if he was God. Jesus Christ is the Son of his father, God, and his mother, Mary. Romans 1:3 is one of the many New Testament verses that speaks of Jesus being of the line of David. Most commentators ignore this clear truth in the Bible in order to maintain the tradition of the Trinity.
[For more on Jesus not being God, see Appendix 10, “Jesus is the Son of God, Not God the Son.” For more on the Holy Spirit, see Appendix 11, “What is the Holy Spirit”].
“and give birth to a son.” Mary was likely 14 years old when she was impregnated by God. It was very typical for girls to be married at 13-15 years old, with 15 being on the older side, and 12-13 being considered on the younger side. Although there were cultural reasons that girls were married that young, one reason that certainly factored in was the number of women who died in childbirth or died young of other causes. Historians estimate that at the time of Christ the average lifespan of a woman was in the early 30’s, some scholars would say 32, whereas the average life expectance of a woman today is 82. That meant that it was important for the strength of the family, the clan, and the society, that girls started having babies quite early so they could have lots of them. A girl who was married at 25 might only have a few years to give birth and start a family. Also, without birth control, girls regularly gave birth to large families (Mary herself had at least seven children; cp. Matt. 13:55). However, the downside to having lots of babies was the increased risk of dying in childbirth or from complications after childbirth, including infections because there was no effective way to treat infections in the biblical period. So for the strength of the family and clan, women generally married very early by our modern standards.
“and will call his name Jesus.” For more on the name “Jesus,” see commentary on Matt. 1:21.