The following is a chapter from the book 'The Da'wah to Islam' by Sheikh Ahmad Mahmoud which can be downloaded from http://www.khilafah.com/images/images/DawahToIslm.pdf Did the Rasool (saw) accept the Najashi, who had embraced Islam, to rule by the law of kufr? The one who carries Islam truthfully, and works with sincerity to re-establish it in ruling and life, whether as an individual or group, is not able to participate in any kufr rule, while claiming that he is working to destroy it. This is because participating in a kufr rule, which applies the systems and laws of kufr, is consolidation of the systems of kufr and not destruction of them. The proof that may be brought, to justify participation in a kufr rule, is nothing but self-deception, before deception to Allah (swt) and the believers. Especially when that proof is in conflict with the Shar’ee evidences, which are definite in meaning and authenticity. It is indeed a severe test and a great sin, for the da’wah carr...