Post 166
e-s The fact that all manuscripts render that as Firstborn is ample evidence that she had many sons.
It would have been only begotten otherwise.
Isaiah 7:14
Therefore the Lord Himself shall give you a sign; Behold, a virgin shall conceive, and bear a son, and shall call his name Immanuel.
No, it does not say a multitude of sons and daughters it says a son, and his name shall be called Immanuel, but it was,nt, it was finally called Jesus.
So if first born means many sons then a son must mean just one. I will take the latter.
The verse is primarily about Jesus, not Mary.
It is to be able to identify the Messiah. The only requirement for Mary was that she was a virgin until after the birth of the Messiah.
After that, the prophecy was fulfilled and her continuing virginity is irrelevant to anything else Jesus did.