Revelation 5:2

And I saw a mighty angel announcing in a loud voice, "Who is fit to open the roll and break its seals?"

Revelation 5:5

But one of the elders said to me, "Do not cry! See! The lion who is of the tribe of Judah, of the line of David, has been victorious so that he can open the roll and break its seals."

Revelation 18:21

Then a mighty angel caught up a stone like a great millstone and threw it into the sea, saying, "With such violence will Babylon the great city be hurled to destruction and never be seen again!

Revelation 10:1

Then I saw another mighty angel descend from heaven. He was clothed in a cloud, and a rainbow encircled his head. His face was like the sun, his legs were like pillars of fire,

Treasury of Scripture Knowledge

Summary

And I saw a strong angel proclaiming with a loud voice, Who is worthy to open the book, and to loose the seals thereof?

Bible References

Who

Revelation 5:5
But one of the elders said to me, "Do not cry! See! The lion who is of the tribe of Judah, of the line of David, has been victorious so that he can open the roll and break its seals."