'Mighty Angel' in the Bible

and to you which are troubled, rest with us; when the Lord Jesus shall show himself from heaven, with his mighty angels,

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

And a mighty angel took up a stone like a great millstone, and cast it into the sea, saying, "With such violence shall that great city Babylon be cast, and shall be found no more.