“All right then, the Lord himself will give you the sign. Look! The virgin will conceive a child! She will give birth to a son and will call him Immanuel (which means ‘God is with us’)

(Isaiah 7:14 NLT).
Isaiah gave King Ahaz of Judah this sign from God to show that within only a few years, the kingdoms of Israel and Syria would be gone. Yet, this prophetic sign had a double fulfillment. It’s present-day fulfillment was for Ahaz, but it’s future fulfillment was for the entire human race. For 700 years later the virgin did indeed give birth to Jesus, the Son of God. Matthew quotes this verse to show its fulfillment in Christ (Matt. 1:23). Christ is the “holy seed” from “Israel’s stump” (Isa. 6:13). The Old Testament contains over 300 Messianic prophecies that are all fulfilled in Christ.