According to the Revelation 7:14-17, these people are those who had faced a great trouble.
Revelation 7:14-17 is a book of Revelation of John, the New Testament of the Christian Bible.
It's been explained in the book that how those people came before the god, and live without hunger or thirst. They had face a lot of troubles.
Basically, Revelation 7:14-17 talks about the Gentiles, who were saved by the Christ.
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