And when the disciples heard it, they fell on their face, and were sore afraid. Fell on their face - Dismayed by the voice, and dazzled by the glory of the cloud. So Daniel, Daniel 8:17, and Saul of Tarsus, Acts 9:4.
Related Commentaries of Matthew 17:6
Matthew 17:6
6 And when the disciples heard it, they fell on their face, and were sore afraid.