'Coming on the Clouds' in the Bible

Then will appear the Sign of the Son of Man in the sky; and then will all the nations of the earth lament, when they see the Son of Man coming on the clouds of the sky with great power and glory.

"I am He," replied Jesus. "But I tell you that, later on, you will see the Son of Man sitting at the right hand of Omnipotence, and coming on the clouds of the sky."