Revelation 5:2

5:2 And I saw a powerful angel proclaiming in a loud voice: “Who is worthy to open the scroll and to break its seals?”

Revelation 10:3

10:3 Then he shouted in a loud voice like a lion roaring, and when he shouted, the seven thunders sounded their voices.

Revelation 16:4

16:4 Then the third angel poured out his bowl on the rivers and the springs of water, and they turned into blood.

Revelation 1:20

1:20 The mystery of the seven stars that you saw in my right hand and the seven golden lampstands is this: The seven stars are the angels of the seven churches and the seven lampstands are the seven churches.