'Coming on the Clouds' in the Bible

and then will appear the sign of the Son of Man in heaven; and then will all the tribes of the earth mourn, and they shall see the Son of Man coming on the clouds of heaven with power and great glory.

Jesus saith to him, "You said it: nevertheless I say to you, henceforth ye shall see the Son of Man sitting on the right hand of power, and coming on the clouds of heaven."