Revelation 7:9–17describes an innumerable multitude standing before the throne and the Lamb. They ascribe glory to God and the Lamb, affirming that salvation belongs to God and the Lamb. This sets off a crescendo of praise from all the angels, the elders, and the four living creatures, all of whom prostrate themselves before the throne and worship God. John is not able to identify the multitude or indicate where they came from, but an elder identifies them as saved survivors of the great tribulation, Further, he explains they are now safe in God’s presence, and will never again hunger or thirst or be scorched by the sun. The Lamb, the elder says, will be their shepherd, and God will wipe away every tear from their eyes.
For a more detailed summary select the link below.
“Revelation 7:9” Bibleref.com
9 After these things I looked, and behold, a great multitude, which no man could count, out of every nation and of all tribes, peoples, and languages, standing before the throne and before the Lamb, dressed in white robes, with palm branches in their hands. 10 They cried with a loud voice, saying, “Salvation be to our God, who sits on the throne, and to the Lamb!”