Revelation 5:1, 9

And I saw in the right hand of him that sat on the throne a book written within and on the backside, sealed with seven seals.

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