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.
But this is a misquote of:
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.
Even worse is the fact that Jesus was born over 700 years too late to fulfill this prophecy in Isaiah 7. When read in context the birth of the child to the young woman (virgin is a mistranslation by the editors of the KJV and also an error on Matthew's part) was to be a sign to King Ahaz that god would destroy Syria and Israel (who had been planning an attack on Judah). God agreed to protect Judah but what actually happened?
2 Chronicles 28:5 Wherefore the LORD his God delivered him[Ahaz] into the hand of the king of Syria; and they smote him, and carried away a great multitude of them captives, and brought them to Damascus. And he was also delivered into the hand of the king of Israel, who smote him with a great slaughter.