Revelation 16:6

For they have shed the blood of saints and prophets, And You have given them blood to drink. For it is their just due."

Surrounding context

16:5 And I heard the angel of the waters saying: "You are righteous, O Lord, The One who is and who was and who is to be, Because You have judged these things.

16:6 For they have shed the blood of saints and prophets, And You have given them blood to drink. For it is their just due."

16:7 And I heard another from the altar saying, "Even so, Lord God Almighty, true and righteous are Your judgments."

Translation and sources