For the phrase “Look, the virgin shall conceive and bear a son, and they shall name him Emmanuel” see Matthew 1:23.

Note that this quote in the New Testament is not taken from the Hebrew Bible but from the Greek Septuagint (LXX) which translates to English as “Look, the virgin shall be with child and bear a son, and you shall name him Emmanouel.” (Translation by NETS — for the Greek version see the title’s tooltip)