The sound of the wings of the cherubim was heard as far as the outer court, like the voice of God Almighty when God speaks.
Ezekiel 10:5 

You never know when an angel will enter your life. It's said the tiny messengers of God can come to Earth in various forms. Yet Ezekiel 10:5 clearly describes an angel by sound and sight. Isn't that the way it should be? You can use your senses to anticipate the tiny holy moments sent by God to serve you. Listen... you can hear the angels waiting in the wings.