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 @AstroLynx - your edit 20th October, 2011  edit summary added bibliographical note on this and other images in the same work added the words 

  

 So this was a general comment about all the art in the book, not speculating as to what the Prophet may or may not have been doing in any particular picture. 

 That would explain why the diff shows that the caption which this information was added makes no reference to any activity  being undertaken  by Muhammad.   "