Thematic Bible: Who serves God

After this, in my vision, I saw a vast throng which no man could number, of men from every nation and of all tribes, and peoples, and languages. They stood in front of the throne and in front of the Lamb, robed in white, holding palm branches in their hands. And they are crying in a loud voice-- ' Salvation be ascribed to our God who is seated on his throne and to the Lamb.' And all the angels were standing round the throne and the Councillors and the four Creatures, and they prostrated themselves on their faces in front of the throne and worshiped God, read more.
saying-- 'Amen. Blessing and praise, and wisdom, and thanksgiving, and honour, and power, and might be ascribed to our God for ever and ever. Amen.' Then one of the Councillors turned to me and said 'Who are these who are robed in white? and whence did they come?' 'My Lord,' I answered, 'it is you who know.' 'These,' he said, 'are they who come through the Great Persecution; they washed their robes white in the blood of the Lamb. And therefore it is that they are before the throne of God, and are serving him day and night in his Temple; and he who is seated on the throne will shelter them.