WHAT IS THE LITTLE BOOK
It appears that the little scroll is the book of Daniel and here are few reasons for this thinking:
The book is little - Daniel has only 12 chapters
IN REVELATION 10
Each time the book is mentioned it's said that is open - this indicates that it was closed (sealed) at some prior point. The book of Daniel is the only book mentioned in the Bible as being sealed until the time of the end (Daniel 12:4, 9)
With the book of Daniel being sealed until the time of the end, it would make sense to expect that at some point the opening of this book would be mentioned and other than Revelation 10; there is no Bible account of the book of Daniel being opened
Daniel did not understand the oath in Daniel 12:8, but was reassured in Daniel 12:9 that the understanding would be given after the time of the end - Revelation 10 is a fulfillment of this promise
The person that made the oath in Daniel 12:7 is described in Daniel 10:5-6 appears to be the same person that makes the oath in Revelation 10. This person is Jesus Christ according to the description given in Revelation 1:13-17.
It seems reasonable to conclude that the little book open in the hand of the angel was the book of Daniel. With the presentation to John of the little book open, the sealed portions of Daniel's prophecy are revealed - the time element, pointing out the end of the 2300-day prophecy.
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