Revelation 5:1
Then I saw a scroll in the right hand of the One seated on the throne. It had writing on both sides and was sealed with seven seals.
Berean Standard Bible
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.
I saw, in the right hand of him who sat on the throne, a book written inside and outside, sealed shut with seven seals.