Isaiah prophesies a virgin will conceive and bear a son called Immanuel — fulfilled when Mary, a virgin, gives birth to Jesus, God with us.
Fulfillment
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. {they...: or, his name shall be called}”
Read the fulfillment