Isaiah 7:14 is a famously contested verse, quoted in Matthew 1:23, Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us. [KJV] Only Jesus could fulfill this prophecy, that a woman who never had carnal love could produce a child. Surely such an impossibility would mean that this child would be a miracle from God.


The Jews claim that this word “virgin” actually just means “young woman” and that this prophecy was fulfilled just a little further down the text in chapter 8:3-4:


And I went unto the prophetess; and she conceived, and bare a son. Then said the Lord to me, Call his name Maher-shalal-hash-baz. For before the child shall have knowledge to cry, My father, and my mother, the riches of Damascus and the spoil of Samaria shall be taken away before the king of Assyria. [KJV]


https://orthodoxreflections.com/virgin-or-young-woman-looking-at-both-the-hebrew-and-greek-reveals-the-perpetual-virginity-of-mary/