Revelation 7:9-14

After this I saw a vast crowd, too great to count, from every nation and tribe and people and language, standing in front of the throne and before the Lamb. They were clothed in white robes and held palm branches in their hands. And they were shouting with a great roar, “Salvation comes from our God who sits on the throne and from the Lamb!” And all the angels were standing around the throne and around the elders and the four living beings. And they fell before the throne with their faces to the ground and worshiped God. They sang, “Amen! Blessing and glory and wisdom and thanksgiving and honor and power and strength belong to our God forever and ever! Amen.” Then one of the twenty-four elders asked me, “Who are these who are clothed in white? Where did they come from?” And I said to him, “Sir, you are the one who knows.” Then he said to me, “These are the ones who died in the great tribulation. They have washed their robes in the blood of the Lamb and made them white.