King James Bible
"As he spake by the mouth of his holy prophets, which have been since the world began:"
This phrase affirms that God has been communicating His redemptive plan through human messengers throughout history. The expression 'by the mouth' emphasizes the prophets as God's spokespersons, not the originators of the message—their words carry divine authority. This hyperbolic expression underscores the ancient and continuous nature of God's prophetic revelation. While not literally from creation, it emphasizes that God's plan of salvation through the Messiah has been unfolding across the vast sweep of human history, connecting Zechariah's present moment to God's longstanding promises.