Matthew 1:25

And knew her not till she had brought forth her firstborn son: and he called his name JESUS.

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

and knew her not till she had brought forth a son: and he called his name JESUS.

and did not know her till she brought forth her son -- the first-born, and he called his name Jesus.

But he had no union with her until she gave birth to a Son. And he gave Him the name Jesus.