Revelation 5:1

 And I saw in the right hand of Him who sat on the throne a scroll written inside and on the back, sealed with seven seals.

Isaiah 29;11  The whole vision has become to you like the words of a book that is sealed, which men deliver to one who is literate, saying, “Read this, please.”  And he says, “I cannot, for it is sealed.”

Matthew 5:34  But I say to you, do not swear at all; neither by heaven, for it is God’s throne…