Old Testament readings use the Septuagint , the Scripture the apostles quoted. Masoretic numbering shown for reference.Learn why
KJV

Revelation 5:9

And they sung a new song, saying, Thou art worthy to take the book, and to open the seals thereof: for thou wast slain, and hast redeemed us to God by thy blood out of every kindred, and tongue, and people, and nation;

Parallel Translations

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They sang a new song, saying, “You are worthy to take the book and to open its seals, for you were killed, and bought us for God with your blood out of every tribe, language, people, and nation,
World English Bible

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