Revelation 6:9-11 - The Fifth Seal
9 When He broke the fifth seal, I saw underneath the altar the souls of those who had been slaughtered for being faithful to God's message and for the testimony they bore to it. 10 Then in a loud voice they cried out, "Holy and true Master, how long will you refrain from charging and avenging our blood upon the inhabitants of the earth?" 11 Then a white robe was given to each of them, and they were told to keep quiet a little while longer, until the number of their fellow-slaves and brothers, who were killed as they had been, was complete.