Revelation 5:2

And I saw a mighty angel crying with a great voice, Who is able to open the book, and to loose its seals?

Revelation 5:5

And one of the elders says to me; Weep not: behold, the Lion of the tribe of Judah, the Root of David, has conquered to open the book, and the seven seals.

Revelation 18:21

And one strong angel lifted up a stone like a great millstone, and cast it into the sea, saying, Thus with a mighty fall shall Babylon the great city, be cast down, and can be found no more.

Revelation 10:1

And I saw another mighty angel coming down out of the heaven, encircled with a cloud: and a rainbow was upon his head, and his face was like the sun, and his feet 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
And one of the elders says to me; Weep not: behold, the Lion of the tribe of Judah, the Root of David, has conquered to open the book, and the seven seals.