Revelation 6:11 in the King James Version
And 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.
Context
10 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?”
11 A long white robe was given to each of them. They were told that they should rest yet for a while, until their fellow servants and their brothers, who would also be killed even as they were, should complete their course.
12 I saw when he opened the sixth seal, and there was a great earthquake. The sun became black as sackcloth made of hair, and the whole moon became as blood.