Revelation 5:2
And I saw mighty angel proclaiming with a loud voice, Who is worthy to open the book, and to break the seals thereon?
Revelation 5:5
And one of the presbyters said unto me, Weep not: behold the lion who is of the tribe of Judah, the root of David, hath prevailed, to open the book, and to break the seven seals upon it.
Revelation 18:21
And a mighty angel took up a stone as a great milestone, and cast it into the sea, saying, So with rapidity shall the great city Babylon be hurled into the deep, and never shall be found more.
Revelation 10:1
AND I saw another mighty angel descending from heaven, clothed with a cloud; and a rainbow on his head, and his countenance as the sun, and his feet as pillars of fire: