A.T. Robertson Commentary Revelation 16:7

"And I heard the altar saying, Yea, O Lord God, the Almighty, true and righteous are thy judgments." — Revelation 16:7 (ASV)

O Lord God, the Almighty (Κυριε ο θεος ο παντοκρατωρ). Just as in 15:3 in the Song of Moses and of the Lamb, vocative with the article ο. "Judgments" (κρισεις) here instead of "ways" (οδο) there, and with the order of the adjectives reversed (αληθινα κα δικαια, true and righteous).