Revelation 6:10

6:10 They cried out with a loud voice, “How long, Sovereign Master, holy and true, before you judge those who live on the earth and avenge our blood?”

Revelation 6:12

6:12 Then I looked when the Lamb opened the sixth seal, and a huge earthquake took place; the sun became as black as sackcloth made of hair, and the full moon became blood red;

Revelation 12:11

12:11 But they overcame him

by the blood of the Lamb

and by the word of their testimony,

and they did not love their lives so much that they were afraid to die.

Revelation 16:3

16:3 Next, the second angel poured out his bowl on the sea and it turned into blood, like that of a corpse, and every living creature that was in the sea died.

Revelation 19:2

19:2 because his judgments are true and just.

For he has judged the great prostitute

who corrupted the earth with her sexual immorality,

and has avenged the blood of his servants poured out by her own hands!”