Adoration of the Lamb of God by all the Saints from the Ghent Altarpiece - by Jan van EYCK . . . . from Cathedral of St Bavo, Ghent
I, John, saw another angel come up from the east holding the seal of the living God. He cried out at the top of his voice to the four angels who were given power to ravage the land and the sea, "Do no harm to the land or the sea or the trees until we imprint this seal on the foreheads of the servants of our God." I heard the number of those who were so marked -- one hundred and forty-four thousand from every tribe of Israel.
After this I saw before me a huge crowd which no one could count from every nation, race, people, and tongue. They stood before the throne and the Lamb, dressed in long white robes and holding palm branches in their hands. They cried out in a loud voice, "Salvation is from our God, Who is seated on the throne, and from the Lamb!" All the angels who were standing around the throne and the elders and the four living creatures fell down before the throne to worship God. They said: "Amen! Praise and glory, wisdom, thanksgiving, and honor, power and might to our God forever and ever. Amen!"
Then one of the elders asked me, "Who do you think these are, all dressed in white? And where have they come from?" I said to him, "Sir, you should know better than I." He then told me, "These are the ones who have survived the great period of trial; they have washed their robes and made them white in the blood of the Lamb.