God with us. In the Old Testament it occurs only in Isaiah 7:14 and 8:8. Most Christian interpreters have regarded these words as directly and exclusively a prophecy of our Saviour, an interpretation borne out by the words of the evangelist (Matthew 1:23).
Source: Easton's Bible Dictionary
Immanuel
that is, God with us , the title applied by the apostle Matthew to the Messiah, born of the Virgin, (Matthew 1:23; Isaiah 7:14) because Jesus was God united with man, and showed that God was dwelling with men.