Luke 1:18-20

18And Zacharias said unto the angel, Whereby shall I know this? for I am an old man, and my wife well stricken in years.

19And the angel answering said unto him, I am Gabriel, that stand in the presence of God; and am sent to speak unto thee, and to shew thee these glad tidings.

20And, behold, thou shalt be dumb, and not able to speak, until the day that these things shall be performed, because thou believest not my words, which shall be fulfilled in their season.