'Coming on the Clouds' in the Bible

Then will appear the sign of the Son of Man in the heavens; and all the peoples of the earth will mourn, when they see the Son of Man coming on the clouds of the heavens,' with power and great glory;

"It is true," Jesus answered; "Moreover I tell you all that hereafter you shall 'see the Son of Man sitting on the right hand of the Almighty, and coming on the clouds of the heavens.'"