Revelation 11:7

And when they shall have finished their testimony, the savage beast which ascends out of the abyss, shall make war against them, and shall conquer them, and kill them.

Revelation 13:7

And it was given to it to make war with the saints, and to overcome them: and there was given to it power over every tribe, and tongue, and nation.

Revelation 13:11

And I saw another beast ascending out of the earth, and it had two horns like a lamb: but it spoke like a dragon.

Revelation 9:1-2

And the fifth angel sounded; and I saw a Star fall from the heaven to the earth; and there was given to him the key of the bottomless pit.

Revelation 11:3

And I will give to my two witnesses commission, and they shall prophesy a thousand two hundred and sixty days, clothed in sackcloth.

Revelation 13:1-4

And I stood upon the sand of the sea, and saw a savage beast ascending out of the sea, having seven heads and ten horns; and upon its horns were ten diadems; and on its heads were the named of defamation.

Revelation 13:16-17

And he causes all, both small and great, rich and poor, freemen and slaves, to receive the mark on their right hand, or on their foreheads;

Revelation 17:6-8

And I saw the woman drunk with the blood of the saints, and with the blood of the martyrs of Jesus: and when I saw her, I wondered with great amazement.

Revelation 19:19-20

And I saw the beast, and the kings of the earth, and their armies gathered together to make war with him who sits upon the white horse, and with his army.

Treasury of Scripture Knowledge

Summary

And when they shall have finished their testimony, the beast that ascendeth out of the bottomless pit shall make war against them, and shall overcome them, and kill them.

Bible References

When

Revelation 11:3
And I will give to my two witnesses commission, and they shall prophesy a thousand two hundred and sixty days, clothed in sackcloth.

The beast

Revelation 13:1
And I stood upon the sand of the sea, and saw a savage beast ascending out of the sea, having seven heads and ten horns; and upon its horns were ten diadems; and on its heads were the named of defamation.
Revelation 17:6
And I saw the woman drunk with the blood of the saints, and with the blood of the martyrs of Jesus: and when I saw her, I wondered with great amazement.
Revelation 19:19
And I saw the beast, and the kings of the earth, and their armies gathered together to make war with him who sits upon the white horse, and with his army.

Out

Revelation 9:2
And he opened the bottomless pit, and smoke ascended from the pit, as the smoke of a great furnace: and the sun and the air were darkened by the smoke of the pit.