Revelation 6:9

6 And a voice came to my ears, from the middle of the four beasts, saying, A measure of grain for a penny, and three measures of barley for a penny: and see that you do no damage to the oil and the wine.

7 And when the fourth stamp was undone, the voice of the fourth beast came to my ears, saying, Come and see.

8 And I saw a grey horse, and the name of him who was seated on it was Death; and Hell came after him. And there was given to them authority over the fourth part of the earth, to put to destruction by the sword, and by taking away their food, and by death, and by the beasts of the earth.

9 And when the fifth stamp was undone, I saw under the altar the souls of those who had been put to death for the word of God, and for the witness which they kept.

10 And they gave a great cry, saying, How long will it be, O Ruler, holy and true, before you take your place as judge and give punishment for our blood to those on the earth?

11 And there was given to every one a white robe, and they were ordered to take their rest for a little time, till the number was complete of the other servants, their brothers, who would be put to death, even as they had been.

12 And I saw when the sixth stamp was undone, and there was a great earth-shock; and the sun became black as haircloth, and all the moon became as blood;