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 7:10

7:10 They were shouting out in a loud voice,

“Salvation belongs to our God,

to the one seated on the throne, and to the Lamb!”

Revelation 9:13

9:13 Then the sixth angel blew his trumpet, and I heard a single voice coming from the horns on the golden altar that is before God,

Revelation 16:17

16:17 Finally the seventh angel poured out his bowl into the air and a loud voice came out of the temple from the throne, saying: “It is done!”

Revelation 19:1

19:1 After these things I heard what sounded like the loud voice of a vast throng in heaven, saying,

“Hallelujah! Salvation and glory and power belong to our God,