Matthew 1:25

Καὶ οὐκ ἐγίνωσκεν αὐτὴν, ἕως οὗ ἔτεκε τὸν υἱὸν αὐτῆς τὸν πρωτότοκον· καὶ ἐκάλεσε τὸ ὄνομα αὐτοῦ Ἰησοῦν.

And he knew her not until she gave birth to her firstborn son; and he called His name Iesus.