Revelation 6:9-10

And when he opened the fifth sea, I saw, under the altar, the souls of those who were slaughtered on account of the word of God, and the testimony which they held.

Treasury of Scripture Knowledge

Summary

And he said, What hast thou done? the voice of thy brother's blood crieth unto me from the ground.

Bible References

Crieth

Revelation 6:10
And they cried with a loud voice, and said, How long, O sovereign Lord, holy and true, before thou dost judge, and avenge our blood upon those who dwell on the earth?