Matthew 1:18, 23-25

Now the birth of Jesus Christ was on this wise: When his mother Mary had been betrothed to Joseph, before they came together she was found with child of the Holy Spirit.

Behold, the virgin shall be with child, and shall bring forth a son, And they shall call his name Immanuel; which is, being interpreted, God with us. And Joseph arose from his sleep, and did as the angel of the Lord commanded him, and took unto him his wife; and knew her not till she had brought forth a son: and he called his name JESUS.