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 8:8

8:8 Then the second angel blew his trumpet, and something like a great mountain of burning fire was thrown into the sea. A third of the sea became blood,

Revelation 16:4

16:4 Then the third angel poured out his bowl on the rivers and the springs of water, and they turned into blood.