Which scripture foretells the virgin birth of Jesus?

The scripture that foretells the virgin birth of Jesus is found in Isaiah 7:14. This verse explicitly states, "The Lord himself will give you a sign: The virgin will conceive and give birth to a son, and will call him Immanuel." This prophecy is significant in Christian theology as it indicates the miraculous nature of Jesus' birth and serves as a foundational reference point for the doctrine of the virgin birth in the New Testament.

The other options do not serve the same purpose. Luke 1:34 refers to Mary's response to the angel announcing her conception, expressing her astonishment and questioning how this could occur since she is a virgin. Matthew 2:1 narrates events surrounding the visit of the Magi after Jesus' birth, while Hebrews 11:1 discusses the nature of faith and does not mention the virgin birth at all. Thus, Isaiah 7:14 is the key prophetic text that foretells the significant event of Jesus' virgin birth.