American Standard Version
and they cried with a great voice, saying, How long, O Master, the holy and true, dost thou not judge and avenge our blood on them that dwell on the earth?

Berean Study Bible
And they cried out in a loud voice, “How long, O Lord, holy and true, until You avenge our blood and judge those who dwell upon the earth?”

Douay-Rheims Bible
And they cried with a loud voice, saying: How long, O Lord (holy and true) dost thou not judge and revenge our blood on them that dwell on the earth?

English Revised Version
and they cried with a great voice, saying, How long, O Master, the holy and true, dost thou not judge and avenge our blood on them that dwell on the earth?

King James Bible
And they cried with a loud voice, saying, How long, O Lord, holy and true, dost thou not judge and avenge our blood on them that dwell on the earth?

World English Bible
They cried with a loud voice, saying, "How long, Master, the holy and true, until you judge and avenge our blood on those who dwell on the earth?"

Young's Literal Translation
and they were crying with a great voice, saying, 'Till when, O Master, the Holy and the True, dost Thou not judge and take vengeance of our blood from those dwelling upon the land?'

Revelation 6:10 Additional Translations ...