Verse

Revelation 6:9

A church father on this verse
But for those who are white and unstained within, it is most suitable to use white and simple garments. Clearly and plainly, therefore, Daniel the prophet says, "Thrones were set, and upon them sat one like the Ancient of days, and His vesture was white as snow." The Apocalypse says also that the Lord Himself appeared…
Clement of Alexandria, 3th c. — The Instructor Book 2
Original

9And when he had opened the fifth seal, I saw under the altar the souls of them that were slain for the word of God, and for the testimony which they held:

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In context

7And when he had opened the fourth seal, I heard the voice of the fourth beast say, Come and see.

8And I looked, and behold a pale horse: and his name that sat on him was Death, and Hell followed with him. And power was given unto them over the fourth part of the earth, to kill with sword, and with hunger, and with death, and with the beasts of the earth.

Revelation 6:9

10And 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?

11And white robes were given unto every one of them; and it was said unto them, that they should rest yet for a little season, until their fellowservants also and their brethren, that should be killed as they were, should be fulfilled.

Read all of Revelation 6