This is from another thread.
I don’t think anything in Scripture is by chance, it all has a purpose. I’m not a quoter, I feel giving exact verses often results in taking things out of context, so I will only site chapter, read it all, it won’t hurt.
I find it interesting that, Mt and Lk approach the annunciation (of the birth of Jesus) from different perspectives. Mt, Chap 1 addresses the annunciation from Joseph’s side, while Lk Chap 1 addresses it from Mary’s. I think this is very significant when viewed from the OT book of Numbers.
We know Mary is a young teenager engaged to be married to Joseph. We know they are both good and pious Jews. We know Mary has knowledge of how children are conceived (I know not man). We know that at that time it was not unusual for engaged couples to have sexual relations, actually being engaged was considered a part of being married. We also know that Mary and Joseph did not yet have sexual relations. The question we must ask ourselves is, did Mary and Joseph intend to have sexual relations after their marriage? Now before you go ballistic, it was not uncommon to dedicate yourself to God, actually if we read Numbers chaps 27-30 we’ll find there were even laws concerning these vows. So the question we need to ask ourselves is, did Mary and Joseph intend to have normal sexual relations after their marriage?
First we’ll take the position of yes, they intended to have sexual relations. When we read the rendering in Lk, the angel greets her, and tells her she is to conceive in her womb and bare a son. Sounds simple enough doesn’t it? Put yourself in Mary’s place. So, I’m engaged to Joseph, we will marry, and have a child, it will be a son. Any question? Shouldn’t be “if” we intended to have sexual relations after marriage. “If” we didn’t intend to have sexual relations after our marriage then we’d ask “how can this be”?
The question “how can this be"? makes absolutely no sense if they intended to have sexual relations, remember she knew “how”. So why did she ask “how can this be”?
Now we’ll take the position of no, they did not intend to have sexual relations, Mary was a consecrated virgin, under a vow of virginity. Read Lk again. The angel greets her, and tells her she is to conceive in her womb and bare a son. Wait a second!!! I’m a dedicated virgin, under a vow of virginity, “how can this be?” This question of her’s only makes sense if she did not intend to have normal sexual relation, if she were under a vow of virginity. Now read Numbers chap 30 about a man taking a woman into his house as his wife who is under a vow. This is the reason Mt talks about Joseph’s side, to insure he knows of the vow, to make sure he knows the true “Father” of the child, to make sure he knows the intimate relationship between Mary and God.