And the Levites who made the music, all of them, Asaph, Heman, Jeduthun, and their sons and brothers, robed in fair linen, were in their places with their brass and corded instruments at the east side of the altar, and with them a hundred and twenty priests blowing horns;
I went on looking till the seats of kings were placed, and one like a very old man took his seat: his clothing was white as snow, and the hair of his head was like clean wool; his seat was flames of fire and its wheels burning fire.
And I said to him, My lord, you have knowledge. And he said to me, These are they who came through the great testing, and their robes have been washed and made white in the blood of the Lamb.