Revelation 6:9-11

Young's Literal Translation

⁹ And when he opened the fifth seal, I saw under the altar the souls of those slain because of the word of God, and because of the testimony that they held,

¹⁰ 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?'

¹¹ and there was given to each one white robes, and it was said to them that they may rest themselves yet a little time, till may be fulfilled also their fellow-servants and their brethren, who are about to be killed -- even as they.