Revelation 5:2
And I saw a mighty angel proclaim with a loud voice, Who is worthy to open the book and to break its seven 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 conquered, he is opening the book and its seven seals.
Revelation 18:21
And a mighty angel took up a stone like a great millstone, and cast it into the sea, saying, Thus with violence shall Babylon the great city be cast down, and shall be found no more.
Revelation 10:1
AND I saw another mighty angel come down from heaven, clothed with a cloud, and an iris was about his head, and his face was like the sun, and his feet like pillars of fire,