Revelation 5:2
And I saw a strong angel crying with a great voice: Who is worthy to open the book, and to break its seals?
Revelation 5:5
And one of the elders said to me: Weep not: behold, the Lion of the tribe of Judah, the root of David, has the power to open the book and its seven seals.
Revelation 18:21
And a mighty angel took up a stone like a great millstone, and threw it into the sea, saying: Thus, with violence shall Babylon, that great city, be thrown down, and shall be found no more at all.
Revelation 10:1
And I saw another mighty angel coming down from heaven, clothed with a cloud; and the rainbow was upon his head, and his face was like the sun, and his feet like pillars of fire.