Revelation 19:2
For His judgments are true and just.
What it says
Heaven praises God because His judgments are true and just and because He has judged the great prostitute and avenged His servants.
What it is doing
This verse gives the moral basis for heaven's rejoicing.
In context
1After this I heard a sound like the roar of a great multitude in heaven, shouting: 2For His judgments are true and just. 3And a second time they called out: 4And the twenty-four elders and the four living creatures fell down and worshiped God who sits on the throne, saying: 5Then a voice came from the throne, saying: