World English Bible

Matthew 1:25

“and didn't know her sexually until she had brought forth her firstborn son. He named him Jesus.”

Verse in context — Matthew 1

Behold, the virgin shall be with child, and shall bring forth 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 brought forth her firstborn son. He named him Jesus.

Jesus as the promised Messiah, fulfilling Old Testament prophecy.