What does the Bible say about the great multitude in Revelation?

In Revelation 7:9-17, John describes a vast multitude that no one could number, representing all nations, tribes, and tongues. This multitude is significant as it illustrates the comprehensive scope of God's grace in salvation, showing that God's elect include people from every walk of life. They stand before the throne of God and the Lamb, clothed in white robes, signifying their righteousness received through Christ's sacrifice. This imagery emphasizes the unity of believers across generations and cultures, all praising God for their salvation.