Thematic Bible: Who serves God

After this I beheld, and lo a great multitude, which no man could number, of all nations, and people, and tongues, stood before the seat, and before the lamb, clothed with long white garments, and palms in their hands, and cried with a loud voice, saying, "Salvation be ascribed to him that sitteth upon the seat of our God, and unto the lamb." And all the angels stood in the compass of the seat, and of the elders and of the four beasts, and fell before the seat on their faces, and worshipped God, read more.
saying, amen, "Blessing and glory, wisdom and thanks, and honour, and power and might, be unto our God, for evermore, amen." And one of the elders answered, saying unto me, "What are these which are arrayed in long white garments, and whence came they?" And I said unto him, "Lord, thou knowest." And he said unto me, "These are they which came out of great tribulation and made their garments large, and made them white in the blood of the lamb: therefore are they in the presence of the seat of God and serve him day and night in his temple, and he that sitteth in the seat will dwell among them.