Revelation 16:5

And I heard the angel of the waters saying, Righteous art thou, who art and who wast, thou Holy One, because thou didst thus judge:

And I heard the angel of the waters ... It is probably a mistake to tie this reference in with the extensive angelology of the Jews. What is probably meant is merely the angel who had poured out the bowl of wrath on the waters.

Righteous art thou, who art and who wast ... We might have expected the phrase "and who is to come" until it is remembered that this vision reveals the state of things when the coming of Christ has already begun.

Thou Holy One, because thou didst thus judge ... This with the next two verses is a kind of parenthesis to show that such terrible judgments are in no sense to be construed as unbecoming or out of character in the one true and living God who gave his Son for our redemption. No! These judgments are exactly what the God of love should do. "The pouring out of the bowls is not a series of arbitrary actions, but a solemn judgment."[20] When people are fully determined and have decided that they will not obey God, nothing could be more just and honorable on the part of the Father than to turn them loose, give them up, harden their hearts, and deliver them completely into the hands of the devil whom they have chosen to obey. That is exactly the state of the situation prophesied here.