Poole on Revelation 7:10: "Salvation to Our God!"
Verse 10: And cried with a loud voice, saying, (Ps. 3:8; Is. 43:11; Jer. 3:23; Hos. 13:4; Rev. 19:1) Salvation to our God (Rev. 5:13) which sitteth upon the throne, and unto the Lamb.
[They were crying (namely, those Confessors of the Jews and those that were gathered from the Gentiles [Grotius]) with a great voice] That is, by public proclamation, so that all might hear (Durham), and with strong affection (Cluverus out of Anselm), and with immense joy, shouting, and most joyful singing (Menochius).
[Salvation (that is, the praise of salvation [Piscator], or of Grace on account of the salvation received [Grotius]: It is a Metonymy [Grotius, Piscator], as κράτος/might/dominion/power, Revelation 1:6; 5:13, is acknowledgment of power [Grotius]: Here, they proclaim salvation, both, from the present calamity [Hammond], from the snares of Antichrist; and also, from all evils, and especially from sins, Matthew 1:21, that is, justification, and the beginning, progress, and perfection of felicity, temporal and spiritual [Durham]) to our God which sitteth upon the throne (understand, is [Piscator, Tirinus, etc.], or, understand, is ascribed [Lapide], or, is from God alone, that is to say, He is the only author of salvation: Here the Dative is used as among the Hebrews with the possessive ל/to, as in Psalm 3:8, Salvationלַיהוָה, to the Lord, that is, He is the author of salvation: Thus a Psalm לְדָוִד, to David, that is, of which David is the author [Beza]: He speaks after the fashion of men, that is to say, Let there be salvation, let the King live [Menochius]: But this is not so much of those wishing for, as of those rejoicing concerning, the blessed immortality and eternity of God [Ribera, Menochius, similarly Pererius, Pareus]: That is to say, We offer congratulations to God for His glory and felicity, from whom is all our salvation [Lapide, similarly Tirinus]: It is not a wish, but thanksgiving [Pareus]; that is to say, Our salvation received from Him we bear [Pareus, Tirinus, similarly Vatablus, Lapide]) and to the Lamb] As the grounds together with the Father (Cotterius): as Mediator (Durham), or man (Pererius), and thus the instrumental and meritorious cause of that (Pererius, thus Durham), as in Revelation 5:13 (Grotius); that is to say, we attribute all the glory of our salvation to God and Christ alone (Gravius, similarly Pareus, Lapide, Forbes); not to our own works or merits (Gravius, thus Durham), not to other mediators (Durham). This is placed over against the errors of Antichrist, who was dividing the praise of salvation among so many, so that only a small portion of it is left for God and the Lamb (Forbes).
Salvation to our God, etc.: They acknowledge their temporal, spiritual, and eternal salvation to the gift and free mercy of God, in whom they had trusted, and to the Lord Jesus Christ, by whose merits and Spirit they had got the victory.
 Greek: καὶ κράζοντες φωνῇ μεγάλῃ, λέγοντες, Ἡ σωτηρία τῷ Θεῷ ἡμῶν τῷ καθημένῳ ἐπὶ τοῦ θρόνου, καὶ τῷ ἀρνίῳ.  Revelation 1:6: “And hath made us kings and priests unto God and his Father; to him be glory and dominion (τὸ κράτος) for ever and ever. Amen.”  Revelation 5:13: “And every creature which is in heaven, and on the earth, and under the earth, and such as are in the sea, and all that are in them, heard I saying, Blessing, and honour, and glory, and power (τὸ κράτος), be unto him that sitteth upon the throne, and unto the Lamb for ever and ever.”