Commentaries:
Barnes' Notes
Whereby shall I know this? - The thing was improbable, and he desired "evidence" that it would take place. The testimony of an "angel," and in such a place, should have been proof enough; but people are slow to believe the testimony of heavenly messengers. As a consequence of not believing, he was struck mute.
Other Barnes' Notes entries containing Luke 1:18:
Daniel 3:28
Titus 2:2
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