Revelation 7:9-12 Two more stanzas of worship before the throne

Revelation 7:9-12 the scene shifts back to worship before the throne of God in heaven another two stanzas are being sung in this worship service. First an uncountable and ethnically diverse multitude sing. The emphasis is that every people group of mankind is represented here.

Salvation to our God who sits on the throne, and to the Lamb.

Then the angels and the four living creatures sing.

Amen, blessing and glory and wisdom and thanksgiving and honor and power and might, be to our God forever and ever. Amen

Why would they sing that salvation belongs to God and the Lamb? Certainly they must be saying that their salvation is entirely due to Them. The multitude is giving God and the Lamb due credit for saving them. And then the angels and four living creatures recap Rev. 5:12.