What does the Bible say about salvation in Revelation 7?

In Revelation 7, John sees a great multitude from all nations and tongues standing before the throne of God, clothed in white robes and worshiping the Lamb. They proclaim, 'Salvation to our God which sitteth upon the throne and unto the Lamb,' indicating that all aspects of salvation are attributed to God alone. The multitude's song of praise emphasizes God's sovereign role in the salvation of His people, reflecting the biblical truth that salvation is by grace through faith, not by works. This cosmic worship is a reminder that God's mercy, election, and redemptive work extend beyond a single nation or tribe, demonstrating His sovereign grace in choosing a people from every corner of the earth.