Through the mouth
Of his holy prophets
From of old.”
καθὼς ἐλάλησεν διὰ στόματος τῶν ἁγίων ἀπ’ αἰῶνος προφητῶν αὐτοῦ
Luke indicated that Zechariah said that God had spoken (καθὼς ἐλάλησεν) through the mouth (διὰ στόματος) of his former older holy prophets (τῶν ἁγίων ἀπ’ αἰῶνος προφητῶν αὐτοῦ). These ancient prophets were servants or messengers of God. Here the term holy was applied to them when it was usually associated with the holy covenant.