Revelation 6:7-11

When the Lamb broke the fourth seal, I heard the voice of the fourth living creature saying, “Come!”

I looked, and behold, an ashen horse; and the one who sat on it had the name Death, and Hades was following with him. Authority was given to them over a fourth of the earth, to kill with sword, and famine, and plague, and by the wild animals of the earth. The Fifth Seal: Martyrs

When the Lamb broke the fifth seal, I saw underneath the altar the souls of those who had been killed because of the word of God, and because of the testimony which they had maintained;

and they cried out with a loud voice, saying, “How long, O Lord, holy and true, will You refrain from judging and avenging our blood on those who live on the earth?”

And a white robe was given to each of them; and they were told that they were to rest for a little while longer, until the number of their fellow servants and their brothers and sisters who were to be killed even as they had been, was completed also. The Sixth Seal: Terror