Nassoshin Shari'ah na Musulunci sun wajabta wa Musulmi yin Ijtihadi. Wannan saboda nassoshin Shari'ah ba su zo ta hanya ta dalla-dalla ba, sai dai sun zo ta hanyar mujmal, wanda ya dace da dukkan al'amuran da suka shafi dan Adam. Fahimtar su da kuma fitar da hukuncin Allah daga cikinsu yana bukatar a yi kokari don karbo hukmin Shar'i ga kowane al'amari. Ko da nassoshin da suka zo ta hanya mai cikakken bayani, suna magana kan cikakkun bayanai, a zahiri suna da hukunci gaba daya ('amm) da kuma mujmal. Misali, ayoyin gado sun zo ta hanya mai bayani kuma suna magana kan cikakkun bayanai, duk da haka dangane da hukunce-hukuncen bangarori suna bukatar fahimta da fitar da hukunci a masaloli da dama kamar masalar kalala da masalolin hijabi (hajab). Dukkan Mujtahidai suna ra'ayin cewa da namiji ko mace, 'ya'ya suna da fifiko a gado a kan 'yan'uwan mamaci, domin kalmar 'walad' (yaro) tana nufin yara na jinsi biyu. Ibn 'Abbas yana ra'ayin cewa 'ya mace ba ta da wannan matsayin, domin kalmar 'Walad' tana nufin namiji kawai. Wannan yana nuna cewa ko da nassoshin da suke magana kan al'amura dalla-dalla sun zo ne a matsayin mujmal, kuma fahimta da fitar da hukunci daga gare su yana bukatar Ijtihadi. Duk da haka, wadannan nassoshi masu bayanin cikakkun bayanai suna bukatar a yi amfani da su ga al'amura da ke faruwa sabo. Wannan amfani kuwa ba shi ne abin da ake nufi da Ijtihadi ba. Abin da ake nufi shi ne fitar da hukunci daga mujmalinsu, ko da suna magana kan cikakkun bayanai, domin suna da hukunci gaba daya ('amm) da kuma mujmal, kuma su nassoshin shari'a ne. Halin nassoshin shari'a shi ne su zama gaba daya da kuma mujmal, ko da sun yi bayanin cikakkun bayanai. Nassoshin Shari'ah, ko daga Alkur'ani ko daga Sunnah, su ne: mafi kyawun nassoshin shari'a ga fagen tunani, mafi fadin fage na samar da hukunci gaba daya, kuma mafi dacewar kasa don noma ka'idoji na gaba daya. Kuma su kaɗai ne suka dace a zama nassoshin doka ga dukkan al'ummomi da ƙasashe. Dangane da kasancewarsu nassoshi mafi kyau ga fagen tunani, wannan yana bayyana ne daga yadda suke ƙunshe da dukkan nau'ikan alaƙoyi. Domin alaƙoyi iri-iri ne, ko alaƙar tsakanin mutane ɗaya-ɗaya ko alaƙar tsakanin ƙasa da 'yan ƙasa ko alaƙar tsakanin ƙasashe, al'ummomi da ƙabilu. Duk yadda waɗannan alaƙoyi suka zama sababbi kuma masu yawa, tunani yana iya fitar da hukunce-hukunce a kansu daga waɗannan nassoshin Shari'a. Saboda haka su ne mafi kyawun nassoshi ga fagen tunani daga cikin dukkan nassoshin doka.
Dangane da kasancewarsu da mafi kyawun fadin ma'ana wajen samar da janar-janar hukunci, hakan a bayyane yake daga jimlolinsu, kalmominsu, salon tsara maganganunsu wajen ƙunshe da ma'anar zahiri (mantuq), ma'anar fahimta (mafhum), ma'ana mai nuni (dalāla) da hujja (ta'lil), da kuma ƙiyasi ga 'illar da ke sa ɗaukar hukunci ga kowane aiki ya yiwu, ya dore kuma ya shafi komai. Wannan yana tabbatar da cewa suna iya ƙunshe kowane abu, cikakku kuma gabaɗaya.
Dangane da kasancewarsu mafi kyawun tushe don noma ƙa'idodi gabaɗaya, hakan yana bayyana ne daga yawan ma'anoni gabaɗaya da waɗannan nassoshi suka ƙunsa, da kuma yanayin waɗannan ma'anoni. Wannan saboda Alƙur'ani da hadisi sun zo da tsararrun layuka na gabaɗaya, har ma idan suna magana kan cikakkun bayanai. Yanayin waɗannan layuka shi ne cewa suna ba Littafi da Sunna ma'anoni gabaɗaya da ƙarƙashinsu ake iya rarraba al'amura gabaɗaya da na musamman. Daga nan ne yawan ma'anoni gabaɗaya ke fitowa. Haka kuma, waɗannan ma'anoni gabaɗaya sun ƙunshi al'amura na gaske da za a iya gani, ba al'amura na zato ba waɗanda aka kai ga su ta hanyar ra'ayi ko hankali kawai. A lokaci guda kuma suna nan don warware matsalolin mutum, ba don mutane na musamman kawai ba; wato don bayyana hukuncin ayyukan ɗan Adam, komai irin sha'awar ɗabi'a da ta tura su zuwa wannan aiki. Saboda haka ne suke iya dacewa da ma'anoni daban-daban da hukunce-hukunce masu yawa. Don haka, nassoshin Shari'ah su ne mafi arziki wajen samar da ka'idoji na gaba ɗaya (qawā'id 'Aammah).
The texts of the Islamic Sharī’ah require the Muslims to perform Ijtihād. This is because the Sharī’ah texts have not come in a detailed manner but have come in ambivalent form (mujmal), applicable to all incidents involving the human kind. Understanding them and deducing the hukm of Allah from them requires the expending of effort to adopt the hukm Shar’i for each incident. Even the texts which have come in an elaborate manner and deal with details, they are in fact general (‘amm) and ambivalent (mujmal). For example, the verses of inheritance have come in an elucidatory manner and deal with minute details, despite that in terms of the partial rules they still require comprehension and deduction in many issues such as the issue of kalala and issues of disinheritance (hajab). All the Mujtahideen take the view that the male or female child take precedence in inheritance over the brothers of deceased because the word ‘walad’ (child) refers to children of both sexes. Ibn 'Abbas holds the view that the girl does not have such role because the word 'Walad' refers to a male only. This shows that even the texts which treat various issues in detail have come as ambivalent (mujmal), and that understanding and deducing a hukm from them requires Ijtihād. However, these texts which deal with details require application to newly occurring incidents. This application however is not what is meant by Ijtihād. What is intended is the inference of a hukm from its ambivalent/equivocal (mujmaliha) even if they deal with details, they are general (‘amm) and ambivalent/equivocal (mujmal) and they are the legislative texts. It is the nature of legislative texts to be general and ambivalent/equivocal (mujmal) even if they dwelve on details. The Sharī’ah texts, whether they are from the Qur’ān or from the Sunnah are ; the best legislative texts for the field of thought, the widest of scope for generalisation, and the most fertile ground to cultivate general principles. And they alone are suitable as legislative texts for all peoples and nations. As for being the best texts for the field of thought that is observable from the way in which they encompass all types of relationships. This is because relationships of all types, whether relationships between individuals or relationships between the state and citizens or relationships between states, peoples and nations. However new and multifarious these relationships may be, the thought is able to deduce rulings for them from those Sharī’ah texts, Therefore they are the best texts for the field of thought from all the legislative texts. As for it having the best scope for generalisation, that is clear from its sentences, words, style of formulating (expressions) in terms of its encompassment of the wording (mantuq), understanding (mafhum), meaning (dalāla) and justification (ta’leel) and analogy to the ‘illah which makes the inference for every action feasible, permanent and inclusive. This insures that it is able to encompass everything, being complete and general. As for it being the the most fertile ground to cultivate general principles, that is apparent from the abundance of general meanings which these texts contain and from the nature of the general meanings. That is because the Qur’ān and the hadīth have come along broad lines even when touching on details. The nature of these broad lines is that they give the Kitab and Sunnah general meanings under which general and specific issues can be classified. And it is from this the abundance of general meanings come. In addition, these general meanings contain real and perceptible issues and not hypothetical issues that have been arrived at theoretically or logically. And at the same time they are there to solve the problems of man and not only for specific individuals that is, to clarify the ruling for the action of human beings, whatever be the instinctual manifestation that may have pushed them to this action. That is why they are applicable to diverse meanings and many rulings. Thus, the Sharī’ah texts are the most fertile ground for producing the general principles (qawaid ‘Aammah).
Wannan shi ne gaskiyar nassosin Shari'a daga mahangar shari'antawa. Haka kuma, idan mun hada da gaskiyar cewa wadannan nassoshi sun zo ne ga bil'adama bisa matsayinsu na mutane, kuma cewa su doka ce ga dukkan al'ummai da jama'a, to a bayyane yake cewa kasancewar Mujtahidai wajibi ne; domin fahimtar wadannan nassoshi ta fuskar shari'a, da aiwatar da su a dukkan zamani, da kuma samo hukuncin Shari'a ga kowace lamari.
This is the reality of the Sharī’ah texts from the legislative viewpoint. Also when we include the fact that these texts have come for human kind in their capacity as human beings and that they are a legislation for all nations and peoples, it becomes clear that the presence of Mujtahiddin is essential; to understand these texts legislatively and apply them in all ages and to derive the Sharī’ah rule for each incident.
Sababbin abubuwa suna faruwa kowace rana, kuma ba su ƙidayuwa. Dole ne mujtahid ya fitar da hukuncin Allah game da kowane abin da ya faru, in ba haka ba abubuwan za su kasance ba tare da sanin hukuncin Allah game da su ba, kuma hakan ba a yarda da shi ba.
New events take place every day and they are innumerable. The mujtahid must deduce the ruling of Allah for each event that takes place otherwise the events will remain as they are without knowledge of the ruling of Allah with regards to them, and this is not allowed.
Ijtihadi fard ne na kifaya (fard ‘ala al-kifaya) a kan Musulmai. Idan wasu suka yi shi, sauran sun tsira daga zunubi. Idan babu wanda ya yi shi, to dukkan Musulmai za su yi zunubi a lokacin da babu mujtahidai. Saboda haka, ba a halatta ko kadan zamani ya zama babu mujtahidi ba, domin fahimtar addini da ijtihadi fard ne na kifaya, wanda idan kowa ya yarda ya bar shi, to zai yi zunubi. Ko da an halatta zamani ya zama babu wanda zai yi shi, to mutanen wancan zamanin za su zama sun amince da batanci, wato barin karɓar hukunce-hukuncen Allah, kuma wannan ba a halatta ba. Balle ma hanyar sanin hukunce-hukuncen Shari'a ita kaɗai ce ta ijtihadi. Idan zamani ya zama babu mujtahidin da mutane za su dogara da shi wajen samun ilimin hukunce-hukunce, hakan zai kai ga dakatar da Shari'a da goge hukunce-hukunce, kuma wannan ba a halatta ba.
Ijtihād is a fard of sufficiency (fard ‘ala al-kifaya) on the Muslims. If some undertake it then the rest are absolved from the sin. If no one performs it then all of the Muslims are sinful in the period when there are no mujtahids. Therefore, it is absolutely not allowed for any age to be devoid of a mujtahid because understanding the deen and Ijtihād is a fard of sufficiency, where if everybody agrees to leave it they will be sinful. Even if it was allowed for an age to be devoid of someone who will undertake it, then the people of that time will have to agree on misguidance, that is, on the abandonment of adopting the rules of Allah and this is not allowed. Not to mention the fact that the method of knowing the Sharī’ah rules is only via Ijtihād. If an age is devoid of a mujtahid on whom people could rely to gain knowledge of the rules, it will lead to the suspension of the Sharī’ah and wiping out of the rules, and this is not allowed.
Mujtahid yana yin iyakar ƙoƙarinsa wajen fitar da hukunci. Idan ijtihadinsa ya yi daidai, to yana da lada biyu, kuma idan ya yi kuskure, zai sami lada ɗaya. Ya ce:
The mujtahid exerts his utmost to derive the rule. If he is correct in his Ijtihād then he has two rewards and if he makes a mistake he will have one. He said