The image below  is a screen shot  displaying Reliance of the Traveller, Book O, Ch.11.10, as it appeared in my browser, which was pointed to  the search result from http://www.muhaddith.org/cgi-bin/e_optns.exe.  Muhaddith is an Islamic web site which maintains a large library consisting mostly of Arabic texts. Reliance of the Traveller is one of the few English translations  available there.  Maktabh.org has a Scribid version of Reliance that will be easier to search and read than the text version which serves as my source.

    This section of the code lists acts which break the treaty of protection, allowing Muslims to kill the violator with impunity.   Take careful note of the fifth item in the enumerated list:  mentioning something impermissible about Islam.  

    What is impermissible to mention?  The answer to this question is to be found in  another section of the code which  lists acts which entail apostasy when committed by a Muslim. The penalty for Apostasy is specified in another section of the code.