Revelation 16:7

And I heard another angel from the altar saying, Yea, Lord God Almighty, true and just are thy judgments.

Revelation 6:9

And when he opened the fifth seal I saw underneath the altar the souls of those who had been slain for the word of God, and for the testimony which they maintained.

Revelation 19:2

because true and righteous are his judgments; for he hath judged the great harlot, that corrupted the earth with her whoredom, and hath avenged the blood of his servants shed by her hand.

Revelation 14:18

And another angel came forth from the altar, having authority over fire; and he cried with a loud voice to him who held the sharp sickle, saying, Put in thy sharp sickle, and gather the bunches of the vine of the earth; for her clusters are ripe.

Revelation 8:3-5

And another angel came, and stood by the altar, holding a golden censer; and there were given to him many perfumes, to offer with the prayers of all the saints upon the golden altar which was before the throne.

Revelation 13:10

If any person leads [others] into captivity, he shall be led into captivity; if any person kills with the sword, he must be slain by the sword. Here is the patience and the faith of the saints.

Revelation 14:10

he also shall drink of the wine of the fury of God, which is mixed undiluted with water in the cup of his wrath; and he shall be tormented with fire and brimstone in the presence of the holy angels, and in the presence of the Lamb:

Revelation 15:3-4

And they sung the sacred ode of Moses the servant of the Lord, and the song of the Lamb, saying, Great and marvellous are thy works, O Lord God Almighty; righteous and true are thy ways, O King of saints.

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 the word of God, and for the testimony which they maintained.
Revelation 8:3
And another angel came, and stood by the altar, holding a golden censer; and there were given to him many perfumes, to offer with the prayers of all the saints upon the golden altar which was before the throne.
Revelation 14:18
And another angel came forth from the altar, having authority over fire; and he cried with a loud voice to him who held the sharp sickle, saying, Put in thy sharp sickle, and gather the bunches of the vine of the earth; for her clusters are ripe.

Even

Revelation 15:3
And they sung the sacred ode of Moses the servant of the Lord, and the song of the Lamb, saying, Great and marvellous are thy works, O Lord God Almighty; righteous and true are thy ways, O King of saints.

True

Revelation 13:10
If any person leads [others] into captivity, he shall be led into captivity; if any person kills with the sword, he must be slain by the sword. Here is the patience and the faith of the saints.
Revelation 14:10
he also shall drink of the wine of the fury of God, which is mixed undiluted with water in the cup of his wrath; and he shall be tormented with fire and brimstone in the presence of the holy angels, and in the presence of the Lamb:
Revelation 19:2
because true and righteous are his judgments; for he hath judged the great harlot, that corrupted the earth with her whoredom, and hath avenged the blood of his servants shed by her hand.