The Khaleefah is restricted in the adoption by the divine rules. He is thus forbidden from adopting a rule that has not been correctly extracted from the divine evidences. He is also obliged to restrict himself to the rules He has adopted, and to the method of Ijtihad (extracting rules) He committed himself to. Therefore, He is forbidden from adopting a rule that has been extracted by a method contrary to the one He had adopted, nor to issue an order that contradicts the rules that He has adopted.

There are two issues here that need closer examination. The first is the restriction by the Ahkam Shari’ah of the Khaleefah in his adoption of the Ahkam. This restricts him in legislation and enacting laws, with the Islamic Shari’ah. He is forbidden from adopting any law contradicting Shari’ah, for any law that contradicts Shari’ah is regarded as Kufr law. If He adopted a rule not derived from Shari’ah knowingly, then it has to be examined. If He believed in the rule that He adopted, but He would become a disbeliever. If He did not believe in it but took it, understanding that it did not contradict Islam, as the Khulafaa’ of Banu ‘Uthman did in their last days, then it would be Haram for him to do so, and He would not become a disbeliever. However, if He has a probable evidence (Shuabhat Daleel), as is the case for the one who puts a law that has no evidence, but only due to an interest (Maslahah) He conceives, referring to the principle of Al-Masalih Al Mursala, the undefined interests, or the principle of Maalat Al-Afa’al, the consequences of the actions, or the principle of Sadd Ath-Thara’i, averting the pretext, or the like. If He deems these as divine principles and evidences, then it would not be prohibited for him and He would not become a disbeliever, but simply mistaken. Accordingly, all the Muslims would regard what He extracted as a divine rule, and they should abide by it if the Khaleefah adopted it. This is because it is a divine rule that had probable evidence, though He was mistaken in the Daleel (evidence) for He is like the one who is mistaken in the extraction from the evidence (Istinbat). However, the Khaleefah must restrict himself in the adoption by the Islamic Shari’ah, and He should be restricted in the adoption from the Shari’ah by the divine rules which are correctly extracted from the Shari’ah evidences. The evidence on that is: