You’re ignoring Matthew 1:18 Now the birth of Jesus Christ took place in this way. When his mother Mary had been betrothed to Joseph, before they came together she was found to be with child from the Holy Spirit. 19And her husband Joseph, being a just man and unwilling to put her to shame, resolved to divorce her quietly.
20But as he considered these things, behold, an angel of the Lord appeared to him in a dream, saying, “Joseph, son of David, do not fear to take Mary as your wife, for that which is conceived in her is from the Holy Spirit. 21She will bear a son, and you shall call his name Jesus, for he will save his people from their sins.” 22 All this took place to fulfill what the Lord had spoken by the prophet:
23 “Behold, the virgin shall conceive and bear a son,
and they shall call his name Immanuel” (which means, God with us).
24When Joseph woke from sleep, he did as the angel of the Lord commanded him: he took his wife, 25but knew her not until she had given birth to a son. And he called his name Jesus.
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I’ve posted this to you before and you have not responded to it. You’ve ignored it. So I’ll ask you the question again. Matthew says that it was fulfilled prophecy.
Was Matthew lying when he wrote that?
Why should we believe you over him?
Isaih 7 is about King Ahaz who was worried about two Assyrian kings and the fate of the Kingdom of Judah. God tried to appease his fears and offered to give Ahaz a sign, anything he wanted, even the Moon!, just so Ahaz would believe that the sing is from God.
Ahaz refuses to ask for a sign because he doesn't want to test God. God then decides to give him a sign anyway. This is where he says the young woman is with a child. Keep in mind that this is taking place 700 years before Christ! Jesus).
The (verse 16) Isaiah says that before the boy is old enough to refuse evil and choose good (we are talking anywhere from age 7-14), the land of those two kings will be forsaken and the threat to Judah will be no more.
So, chronologically it cannot be about Jesus because that would mean that Jesus was born 700 years before his New Testament birth, ore that Ahaz lived to be more than 700 years old to find out that the sign was really from God.