Matthew 1:18; Matthew 1:22-23

18 The birth of Jesus Christ took place in this way. His mother Mary had been promised to Joseph in marriage. But before they were married, Mary realized that she was pregnant by the Holy Spirit.
22 All this happened so that what the Lord had spoken through the prophet came true: 23 "The virgin will become pregnant and give birth to a son, and they will name him Immanuel," which means "God is with us."