5 Then I heard the angel in charge of the waters say: “You are just in these judgments, O Holy One, you who are and who were;

Read Revelation 16:5 Using Other Translations

And I heard the angel of the waters say, Thou art righteous, O Lord, which art, and wast, and shalt be, because thou hast judged thus.
And I heard the angel in charge of the waters say, "Just are you, O Holy One, who is and who was, for you brought these judgments.
And I heard the angel who had authority over all water saying, “You are just, O Holy One, who is and who always was, because you have sent these judgments.