Luke 1:18-20

Zechariah asked the angel, “How do you expect me to believe this? I’m an old man and my wife is too old to give me a child. What sign can you give me to prove this will happen?” Then the angel said, “I am Gabriel. I stand beside God himself. He has sent me to announce to you this good news. But now, since you did not believe my words, you will be stricken silent and unable to speak until the day my words have been fulfilled at their appointed time and a child is born to you. That will be your sign!”