Matthew 1:22

Joseph, her husband, being a righteous man, and not willing to make her a public example, intended to put her away secretly.

But when he thought about these things, behold, an angel of the Lord appeared to him in a dream, saying, “Joseph, son of David, don’t be afraid to take to yourself Mary as your wife, for that which is conceived in her is of the Holy Spirit.

She shall give birth to a son. You shall name him Jesus, for it is he who shall save his people from their sins.”

“Behold, the virgin shall be with child,

and shall give birth to a son.

They shall call his name Immanuel,”

which is, being interpreted, “God with us.”

Joseph arose from his sleep, and did as the angel of the Lord commanded him, and took his wife to himself;

and didn’t know her sexually until she had given birth to her firstborn son. He named him Jesus.