Albert Barnes Commentary Revelation 19:2

"for true and righteous are his judgments; for he hath judged the great harlot, her that corrupted the earth with her fornication, and he hath avenged the blood of his servants at her hand." — Revelation 19:2 (ASV)

For true and righteous are his judgments. That is, the calamities that come upon the power here referred to are deserved.

For he has judged the great whore. The power represented by the harlot (see Barnes on Revelation 17:1).

Which did corrupt the earth with her fornication (see Barnes on Revelation 14:8; Revelation 17:2; Revelation 17:4; Revelation 17:5; and Revelation 18:3. Compare Barnes on Revelation 9:21).

And has avenged the blood of his servants (see Barnes on Revelation 18:20 and Revelation 18:24).

At her hand. Shed by her hand.