Thematic Bible: Who serves God

After this I beheld, and lo, a great multitude, which no one could number, out of all nations, and tribes, and people, and languages, standing before the throne and before the Lamb, clothed in white robes, and with palms in their hands; and crying with a loud voice, saying, Salvation be ascribed to our God, who sitteth upon the throne, and to the Lamb. And all the angels stood round the throne, and round the elders, and the four animate beings; and fell on their faces before the throne, and worshipped God, saying, Amen: read more.
Blessing, and glory, and wisdom, and thanksgiving, and honor, and power, and strength be ascribed to our God for ever and ever. Amen. And one of the elders said unto me, Who are these that are clothed in white robes, and from whence did they come? And I said unto him, Sir, thou knowest. And he said to me, These are they who come out of great affliction, and have washed their robes, and made them white in the blood of the Lamb. Therefore they are before the throne of God, and serve Him day and night in his temple: and He that sitteth upon the throne shall dwell among them.