Revelation 7:12

After these things I looked, and behold, a great multitude which no man could count, out of every nation and of all tribes, peoples, and languages, standing before the throne and before the Lamb, dressed in white robes, with palm branches in their hands.

They cried with a loud voice, saying, “Salvation be to our God, who sits on the throne, and to the Lamb!”

All the angels were standing around the throne, the elders, and the four living creatures; and they fell on their faces before his throne, and worshiped God,

One of the elders answered, saying to me, “These who are arrayed in the white robes, who are they, and where did they come from?”

I told him, “My lord, you know.”

He said to me, “These are those who came out of the great suffering. They washed their robes and made them white in the Lamb’s blood.

Therefore they are before the throne of God, and they serve him day and night in his temple. He who sits on the throne will spread his tabernacle over them.