'Back' in the Bible

Something like a sea of glass, similar to crystal, was also before the throne. Four living creatures covered with eyes in front and in back were in the middle and around the throne.

Then I saw in the right hand of the One seated on the throne a scroll with writing on the inside and on the back, sealed with seven seals.

Pay her back the way she also paid,and double it according to her works.In the cup in which she mixed,mix a double portion for her.