Luke 1:35

35 And the angel answered and said unto her, The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God.
καὶ ἀποκριθεὶς ὁ ἄγγελος εἶπεν αὐτῇ Πνεῦμα ἅγιον ἐπελεύσεται ἐπὶ σέ καὶ δύναμις ὑψίστου ἐπισκιάσει σοι· διὸ καὶ τὸ γεννώμενον ἅγιον κληθήσεται υἱὸς θεοῦ