Rev. 7:9-17

      9 After these things I saw, and, look! a great crowd, which no man was able to number, out of all nations and tribes and peoples and tongues, standing before the throne and before the Lamb, dressed in white robes; and there were palm branches in their hands. 10 And they keep on crying with a loud voice, saying: "Salvation [we owe] to our God, who is seated on the throne, and to the Lamb."
     11 And all the angels were standing around the throne and the elders and the four living creatures, and they fell upon their faces before the throne and worshiped God, 12 saying: "Amen! The blessing and the glory and the wisdom and the honor and the power and the strength [be] to our God forever and ever. Amen."
     13 And in response one of the elders said to me: "These who are dressed in the white robes, who are they and where did they come from?" 14 So right away I said to him: "My lord, you are the one that knows." And he said to me: "These are the ones that come out of the great tribulation, and they have washed their robes and made them white in the blood of the Lamb. 15 That is why they are before the throne of God; and they are rendering him scared service day and night in his temple; and the One seated on the throne will spread his tent over them. 16 They hunger no more nor thirst anymore, neither will the sun beat down upon them nor any scorching heat, 17 because the Lamb, who is in the midst of the throne, will shepherd them, and guide them to fountains of waters of life. And God will wipe out every tear from their eyes."