'Mighty Angel' in the Bible

And to you who are troubled rest with us, when the Lord Jesus shall be revealed from heaven with his mighty angels,

And I saw another mighty angel come down from heaven, clothed with a cloud: and a rainbow was upon his head, and his face was as it were the sun, and his feet as pillars of fire:

And a mighty angel took up a stone like a great millstone, and cast it into the sea, saying, Thus with violence shall that great city Babylon be thrown down, and shall be found no more at all.