'Inside' in the Bible

And the four beasts, having every one of them six wings, are full of eyes round about and inside: and without resting day and night, they say, Holy, holy, holy, Lord God, Ruler of all, who was and is and is to come.

And I saw in the right hand of him who was seated on the high seat, a book with writing inside it and on the back, shut with seven stamps of wax.