Gabriel tells Zechariah he will be silent and unable to speak because he did not believe the angel’s words about Elizabeth bearing a son. The silence is given as a sign until the day the promise is fulfilled (Luke 1:18–20).
In Luke 1:8–25, Zechariah is chosen to burn incense in the temple while the people pray outside. An angel appears and tells him his request has been heard: Elizabeth will bear a son named John, whose life will mark him out for a special role among Israel. This scene continues Luke’s opening birth narrative that introduces key characters and sets up parallel beginnings for John and Jesus. Just before this, Luke has described Zechariah and Elizabeth as faithful yet childless, creating a tension the announcement answers.
Luke presents Zechariah’s temple service as a public, ordered act of worship: a priest chosen by lot enters the sanctuary to burn incense while the gathered people pray outside (verses 8–10).
A careful answer keeps the immediate passage, the book's argument, and the whole-Bible storyline together, so the question is answered in context instead of as a detached idea.
Start with Luke 1:18-20, then read the surrounding section so the answer stays connected to the passage's flow.
18Zacharias said to the angel, "How can I be sure of this? For I am an old man, and my wife is well advanced in years."
19The angel answered him, "I am Gabriel, who stands in the presence of God. I was sent to speak to you, and to bring you this good news.
20Behold, you will be silent and not able to speak, until the day that these things will happen, because you didn`t believe my words, which will be fulfilled in their proper time."