A lokacin zamanin Sahabbai (sahabah), Musulmi suna cire ahkamin shar'antaka (AHkam shar'aiah) daga Littafi da Sunnah da kansu. Alkalai, idan suka fuskanci rigingimun mutane, suna kuma cire hukuncin shari'a (hukm shar'ai) da kansu ga kowace matsala ko al'amari da suka tarar da shi. Shugabanni, tun daga Ameer al-Mu'mineen har zuwa Wulat da sauransu, suna cire ahkamin shari'a da kansu don warware kowace matsala da ta taso a lokacin mulkinsu. Abu-Musa al-Ash'ari da Shuraih (raa) sune alkalai biyu (qadi) da suka cire hukunce-hukuncen (AHkam) suka yi hukunci da ijtihadinsu. Mu'adh ibn Jabal (r.a) gwamna ne (wali) a lokacin Manzon Allah ﷺ, yana cire ahkami kuma yana yin mulki a wilayarsa da ijtihadinsa. Abu Bakr da Umar (ra) duka sun cire ahkami da kansu a lokacin mulkinsu, kuma duka biyun sun yi wa mutane hukunci da ijtihadin da kowannensu ya cire. Mu'awiya da Amr ibn al-'Aas sun kasance gwamnoni biyu da suka cire ahkami da kansu ta hanyar ijtihadinsu, suka kuma yi wa mutane hukunci bisa hakan a lardunansu. Duk da ijtihadin da alkalai da gwamnoni suke yi, Khalifa yana karɓar wasu ahkami ya kuma umurci mutane su aiwatar da su, waɗanda kuma za su zama tilas su aiwatar da dokokin da aka karɓa, su bar ra'ayinsu da ijtihadinsu a kan waɗannan dokoki. Wannan saboda hukm shar'ai ya ce umarnin Imam za a aiwatar da shi a fili da a boye. Misali shi ne karɓar da Abu Bakr ya yi cewa furta saki sau uku a zama ɗaya tana zama saki ɗaya kawai, da kuma karɓarsa cewa a raba kuɗaɗe daidai tsakanin Musulmi ba tare da la'akari da lokacin da suka musulunta ba ko wani al'amari. Musulmi sun bi Abu Bakr a wadannan karɓe-karɓe, alkalai da gwamnoni kuma suka aiwatar da su. Lokacin da Umar ya karɓi mulki bayansa, ya karɓi ra'ayoyi daban-daban a kan tambayoyin nan guda. Ya wajabta wa umurta mutane su karɓi tare da aiwatar da hukuncin saki uku a zama ɗaya a matsayin saki uku, kuma ya raba kuɗaɗe daban-daban bisa ga lokacin da mutane suka shiga Musulunci da kuma bisa buƙata. Musulmai sun bi 'Umar a waɗannan tsare-tsare, kuma alƙalai da gwamnoni sun aiwatar da su. 'Umar kuma ya yanke shawarar cewa filayen da aka samu a yaƙi ghanima ce mallakar Bait ul Mal (Baitul-Mali), inda ainihin masu filayen za su ci gaba da riƙe su, ba kuma za a raba filayen ga sojojin Musulmai ko Musulmai ba. Gwamnoni da alƙalai sun bi shi a wannan tsari, suka aiwatar da hukunce-hukuncen da ya ɗauka. Saboda haka, ijma'in Sahabbai (ijma'a as-sahabah) ya tabbatar da cewa Imam yana da ikon ɗaukar wasu hukunce-hukunce da umartar a aiwatar da su, kuma Musulmai dole ne su yi masa biyayya, koda ijtihadin su ya saɓa da hakan. Daga cikin sanannun ƙa'idodin shari'a akwai:

During the era of the Companions (sahabah), the Muslims used to extract the AHkam shar’aiah from the Book and the Sunnah by themselves. The judges, when tackling the disputes among people, would deduce by themselves the hukm shar’ai for every issue or event that they were faced with. The rulers, starting with the Ameer al-Mu'mineen to the Wulat and others, would themselves deduce the AHkam shar’aiah to solve every problem that arose during their ruling. Abu-Musa al Ash'ari and ShuraiH (raa) were two judges (qadi) who deduced the rules (AHkam) and judged by their own ijtihad. Mu'adh ibn Jabal (r.a) was a governor (wali) at the time of the Prophet (saw) and used to deduce aHkam and ruled in his wilayah by his own ijtihad. Abu Bakr and Umar (ra) both deduced aHkam by themselves during their ruling and both ruled the people with the ijtihad each of them had deduced. Muawiya and Amr ibn al 'Aas were two governors who deduced aHkam for themselves by their own ijtihad and ruled people in accordance with it in their provinces. In spite of the ijtihad undertaken by the judges and governors, the Khaleefah used to adopt certain aHkam and to order their execution by the people who would be obliged themselves to implement the adopted rules and to leave their own opinion and ijtihad on those rules. This is because the hukm shar’ai states that the Imam's decree is to be executed openly and covertly. Examples of this is Abu Bakr's adoption that the pronouncement of divorce three times in one sitting constitutes only one divorce, and his adoption that funds should be equally distributed among Muslims irrespective of the time when they embraced Islam or any other matter. The Muslims followed Abu Bakr in these adoptions and the judges and governors executed them. When 'Umar came to office after him he adopted different opinions in the same questions. He obliged people to accept and execute the pronouncement of divorce three times in one sitting as three divorces, and he distributed the funds differently according to the time when the people had entered Islam and according to need. The Muslims followed 'Umar in these adoptions and the judges and governors executed them. 'Umar also made the adoption that land obtained in war was a ghanima owned by the Bait ul Mal (House of Funds), wherein the original owners would retain possession and not distribute the land to the Muslim soldiers or the Muslims. The governors and judges followed him in this adoption and enacted the aHkam he had adopted. Accordingly, the consensus of the Companions (ijma'a as-sahabah) confirms that the Imam has the authority to adopt certain rules and order that they be executed and the Muslims must obey him, even if their ijtihad differs from it. Among the well known shar’aiah principles are:

Sarki yana da haƙƙin kafa dokoki kamar yadda matsalolin da ake fuskanta a zahiri suke da yawa.

"The Sultan has the right to adopt decrees as numerous as the actual problems";.

"Hukuncin Imam ya kawo ƙarshen rikici"; kuma.

"The Imam's decre e resolves the discord"; and.

"Ana aiwatar da umarnin Imam a fili da a ɓoye."

"The Imam's command is executed openly and covertly".

Daga yanzu, Khulafa'u sun karɓi wasu takamaiman Ahkam. Harun ar-Rashid, misali, ya karɓi littafin Kitab al-Kharaj a harkokin tattalin arziki, kuma ya wajabta wa dukkan mutane aiwatar da Ahkam ɗin da ke cikinsa.

Henceforth, the Khulafa'a adopted specific AHkam. Haroon ar-Rasheed, for example, adopted the book Kitab al-Kharaj in the economic affairs, and he obliged all the people to execute the AHkam included within it.