Revelation 16:7

And I heard the altar say, "Yes, Lord God Almighty! Your sentences are true and just."

Revelation 6:9

When He broke the fifth seal, I saw underneath the altar the souls of those who had been slaughtered for being faithful to God's message and for the testimony they bore to it.

Revelation 19:2

because His judgments are true and just. Because He has passed judgment on the notorious prostitute who corrupted the earth with her immorality, and for the blood of His slaves He has taken vengeance upon her!"

Revelation 14:18

And another angel came from the altar, who had power over the fire, and he called in a loud voice to him who had the sharp sickle, "Put forth your sharp sickle, and gather the bunches of grapes from the earth's vine, because its grapes are fully ripe."

Revelation 8:3-5

Then another angel with a censer of gold came and stood at the altar, and a great quantity of incense was given to him to mingle with the prayers of all God's people, on the altar of gold that stood before the throne.

Revelation 13:10

Whoever leads others into captivity will go into captivity himself. Whoever kills with the sword must be killed with the sword himself. In this way will be shown the patient endurance and the fidelity of God's people.

Revelation 14:10

himself will have to drink the wine of God's vengeance, poured unmixed into the cup of His wrath, and be tortured with fire and brimstone before the eyes of the holy angels and the Lamb.

Revelation 15:3-4

And they were singing the song of Moses, the slave of God, and the song of the Lamb: "Great and wonderful are your works, Lord God, Almighty One; upright and true your ways, O King of the ages.

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
When He broke the fifth seal, I saw underneath the altar the souls of those who had been slaughtered for being faithful to God's message and for the testimony they bore to it.
Revelation 8:3
Then another angel with a censer of gold came and stood at the altar, and a great quantity of incense was given to him to mingle with the prayers of all God's people, on the altar of gold that stood before the throne.
Revelation 14:18
And another angel came from the altar, who had power over the fire, and he called in a loud voice to him who had the sharp sickle, "Put forth your sharp sickle, and gather the bunches of grapes from the earth's vine, because its grapes are fully ripe."

Even

Revelation 15:3
And they were singing the song of Moses, the slave of God, and the song of the Lamb: "Great and wonderful are your works, Lord God, Almighty One; upright and true your ways, O King of the ages.

True

Revelation 13:10
Whoever leads others into captivity will go into captivity himself. Whoever kills with the sword must be killed with the sword himself. In this way will be shown the patient endurance and the fidelity of God's people.
Revelation 14:10
himself will have to drink the wine of God's vengeance, poured unmixed into the cup of His wrath, and be tortured with fire and brimstone before the eyes of the holy angels and the Lamb.
Revelation 19:2
because His judgments are true and just. Because He has passed judgment on the notorious prostitute who corrupted the earth with her immorality, and for the blood of His slaves He has taken vengeance upon her!"