Which Old Testament scripture portrays a prophecy about Christ's future impact?

Isaiah 7:14 contains a profound prophecy regarding the coming Messiah, indicating that a virgin will conceive and give birth to a son, and his name will be called Immanuel, which means "God with us." This passage is foundational in the Christian understanding of the prophecy concerning the birth of Jesus Christ, highlighting his divine nature and the significance of his coming.

In the context of the other passages, Genesis 1:1 discusses the creation of the world, which, while crucial to understanding God's plan, does not contain a specific prophecy about Christ. Numbers 21:9 describes Moses making a bronze serpent, which serves as a symbol, later referenced in the New Testament, but it is not a direct prophecy about Christ's impact. Proverbs 3:5 offers wisdom about trusting in the Lord, which is essential for faith, yet it does not specifically forecast the Messiah's coming or influence. Thus, Isaiah 7:14 stands out as the clear prophetic declaration regarding the future impact of Christ on humanity.