Matthew 1:25
and didn’t know her sexually until she had given birth to her firstborn son. He named him Jesus.
World English Bible (Public Domain)
In context
Before · Matthew 1:23–24
23“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.” 24Joseph arose from his sleep, and did as the angel of the Lord commanded him, and took his wife to himself;
25and didn’t know her sexually until she had given birth to her firstborn son. He named him Jesus.