Revelation 16:7

And I heard the altar cry, "Even so, Lord God almighty: true and just are thy sentences of doom."

Revelation 6:9

And when he opened the fifth seal, I saw underneath the altar the souls of those who had been slain for adhering to God's word and to the testimony which they bore;

Revelation 19:2

True and just are his sentences of doom; he has doomed the great Harlot who destroyed earth with her vice, he has avenged on her the blood of his servants."

Revelation 14:18

and another angel came from the altar ??he who has power over fire ??and called loudly to the one who had the sharp sickle, "Thrust your sharp sickle in, cull the clusters from the Vine of earth, for its grapes are fully ripe."

Revelation 8:3-5

And another angel went and stood at the altar with a golden censer; he was given abundant incense, to be laid with the prayers of all the saints upon the golden altar in front of the throne;

Revelation 14:10

he shall drink the wine of God's passion, poured out untempered in the cup of his anger, and shall be tortured with fire and brimstone before the holy angels and before the Lamb:

Revelation 15:3-4

and they were singing the song of Moses the servant of God and the song of the Lamb ??"Great and marvellous are thy deeds, Lord God almighty! Just and true thy ways, O King of nations!

Treasury of Scripture Knowledge

Summary

And I heard another out of the altar say, Even so, Lord God Almighty, true and righteous are thy judgments.

Bible References

Out

Revelation 6:9
And when he opened the fifth seal, I saw underneath the altar the souls of those who had been slain for adhering to God's word and to the testimony which they bore;
Revelation 8:3
And another angel went and stood at the altar with a golden censer; he was given abundant incense, to be laid with the prayers of all the saints upon the golden altar in front of the throne;
Revelation 14:18
and another angel came from the altar ??he who has power over fire ??and called loudly to the one who had the sharp sickle, "Thrust your sharp sickle in, cull the clusters from the Vine of earth, for its grapes are fully ripe."

Even

Revelation 15:3
and they were singing the song of Moses the servant of God and the song of the Lamb ??"Great and marvellous are thy deeds, Lord God almighty! Just and true thy ways, O King of nations!

True

Revelation 14:10
he shall drink the wine of God's passion, poured out untempered in the cup of his anger, and shall be tortured with fire and brimstone before the holy angels and before the Lamb:
Revelation 19:2
True and just are his sentences of doom; he has doomed the great Harlot who destroyed earth with her vice, he has avenged on her the blood of his servants."