Matthew 1:18, 23-25

Now the birth of Jesus Christ was as follows: when His mother Mary had been betrothed to Joseph, before they came together she was found to be with child by [the power of] the Holy Spirit.

“BEHOLD, THE VIRGIN SHALL BE WITH CHILD AND GIVE BIRTH TO A SON, AND THEY SHALL CALL HIS NAME IMMANUEL”—which, when translated, means, “GOD WITH US.” [Is 7:14] Then Joseph awoke from his sleep and did as the angel of the Lord had commanded him, and he took Mary [to his home] as his wife, but he kept her a virgin until she had given birth to a Son [her firstborn child]; and he named Him Jesus (The LORD is salvation).