Fiqh is Islamic jurisprudence. Fiqh is often described as the human understanding and practices of the sharia, that is human understanding of the divine Islamic law as revealed in the Quran and the Sunnah. Fiqh expands and develops Shariah through interpretation (ijtihad) of the Quran and Sunnah by Islamic jurists (ulama) and is implemented by the rulings (fatwa) of jurists on questions presented to them. Thus, whereas sharia is considered immutable and infallible by Muslims, fiqh is considered fallible and changeable. Fiqh deals with the observance of rituals, morals and social legislation in Islam as well as economic and political system. In the modern era, there are four prominent schools (madh'hab) of fiqh within Sunni practice, plus two within Shi'a practice. A person trained in fiqh is known as a faqīh.

Jaʿfar ibn Muḥammad ibn ʿAlī al-Ṣādiq, commonly known as Jaʿfar al-Ṣādiq, was an 8th-century Shia Muslim scholar, jurist, and theologian. He was the founder of the Jaʿfarī school of Islamic jurisprudence and the sixth Imam of the Twelver and Ismāʿīlī denominations of Shīʿa Islam. The traditions (ḥadīth) recorded from al-Ṣādiq and his predecessor, Muḥammad ibn ʿAlī al-Bāqir, are said to be more numerous than all the ḥadīth reports preserved from the Islamic prophet Muhammad and the other Shīʿīte Imams combined. Among other theological contributions, he elaborated the doctrine of nass and isma, as well as that of taqiya.

Zayd ibn ʿAlī, also spelled Zaid, was the son of Ali ibn al-Husayn Zayn al-Abidin, and great-grandson of Ali ibn Abi Talib. He led an unsuccessful revolt against the Umayyad Caliphate, in which he died. The event gave rise to the Zaydiyya sect of Shia Islam, which holds him as the next Imam after his father Ali ibn al-Husayn Zayn al-Abidin. Zayd ibn Ali is also seen as a major religious figure by many Sunnis and was supported by the prominent Sunni jurist, Abu Hanifa, who issued a fatwa in support of Zayd against the Umayyads.

Abū al-Fiḍā’ ‘Imād ad-Dīn Ismā‘īl ibn ‘Umar ibn Kathīr al-Qurashī al-Damishqī, known as Ibn Kathīr, was a highly influential Arab historian, exegete and scholar during the Mamluk era in Syria. An expert on tafsir and fiqh (jurisprudence), he wrote several books, including a fourteen-volume universal history titled Al-Bidaya wa'l-Nihaya.

Tafsir refers to exegesis, usually of the Quran. An author of a tafsir is a mufassir. A Quranic tafsir attempts to provide elucidation, explanation, interpretation, context or commentary for clear understanding and conviction of God's will.

An-Nisa' is the fourth chapter (sūrah) of the Quran, with 176 verses (āyāt). The title derives from the numerous references to women throughout the chapter, including verse 34 and verses 127–130.

The Hypocrites is the 63rd chapter (surah) of the Qur'an, with 11 verses. Almost all of the chapter is preserved in the Ṣan‘ā’1 lower text.

Al-Mulk is the 67th chapter (surah) of the Quran, comprising 30 verses. The surah emphasizes that no individual can impose his will on another; he may only guide and set an example (67:26).

Abū ʿAbd Allāh Muḥammad ibn Yazīd Ibn Mājah al-Rabʿī al-Qazwīnī (Arabic: ابو عبد الله محمد بن يزيد بن ماجه الربعي القزويني; commonly known as Ibn Mājah, was a medieval scholar of hadith of Persian origin. He compiled the last of Sunni Islam's six canonical hadith collections, Sunan Ibn Mājah.

Esoteric interpretation of the Quran is the allegorical interpretation of the Quran or the quest for its hidden, inner meanings. The Arabic word taʾwīl was synonymous with conventional interpretation in its earliest use, but it came to mean a process of discerning its most fundamental understandings. "Esoteric" interpretations do not usually contradict the conventional interpretations; instead, they discuss the inner levels of meaning of the Quran.

Abū Muḥammad Sufyān ibn ʽUyaynah ibn Maymūn al-Hilālī al-Kūfī was a prominent eighth-century Islamic religious scholar from Mecca. He was from the third generation of Islam referred to as the Tābiʽu al-Tābiʻīn, "the followers of the followers". He specialized in the field of hadith and Qur'an exegesis and was described by al-Dhahabī as shaykh al-Islam—a preeminent Islamic authority. Some of his students achieved much renown in their own right, establishing schools of thought that have survived until the present.

Tafsir Furat Kufi is an exegesis of the Quran by Furat Ibn Furat Ibn Ibrahim al-Kufi and is one of the oldest Shia Quranic commentaries. It is the most famous book of the author and is a commentary based upon traditions (Hadith). The traditions used by this book are mainly narrated either from Muhammad al-Baqir, Jafar al-Sadiq or Ali's disciples such as `Abd Allah ibn `Abbas, Mujahid and Asbagh Ibn Nubata; although there are some that relate to one of the companions of Muhammad. Tafsir Furat Kufi is similar to Tafsir Ayyashi and Tafsir Qomi in that it is selective in offering commentary on Quranic verses. Unlike the two mentioned Tafsirs however, Tafsir Furat Kufi has a Shia Islam outlook and focuses only on verses that include Shia allusions. Tafsir Furat Kufi can be titled an Imami exegesis in all aspects. It has been cited extensively by many Shia scholars of later generations. For example, in his introduction to Bihar al-Anwar, Majlisi counts Tafsir Furat Kufi among the most important sources for his composition. Many old manuscripts of Tafsir Furat Kufi are found in Iran and Iraq.

Yaḥyā b. Abī l-Qāsim al-Asadī (d. 150 AH / 767 AD), known as Abū Baṣīr al-Asadī or simply Abu Basir was a Imami figure in Kufa. Abu Basir al-Asadi was in the company of Muhammad al-Baqir for a long time and after that he became one of the companions of Jafar al-Sadiq. Abu Basir's name is included in the number of six companions of al-Baqir and al-Sadiq that hadiths narrated by any one of them is considered authentic by many Shi'a scholars. Some consider Abu Basir al-Moradi as one of those six people instead of Abu Basir al-Asadi. A large number of religious and jurisprudential traditions in Imamiyyah hadith books, which were narrated from al-Sadiq through Abu Basir, show the extent of their association.Shaykh Tusi listed him among the companions of Musa al-Kadhim too. In addition to narrating from imams, Abu Basir al-Asadi has conveyed Hadiths narrated from some Imami narrators such as Abu Hamza al-Thumali and Saleh (Imran) ibn Maytham.

Abu 'Abd al-Rahman Muhammad Bin al-Husayn al-Sulami al-Shafi'i, commonly known as Muhammad Bin Husayn al-Sulami (425-412) the Sufi master of Nishapur and Shafi'i traditionist, muffassir, historian, and a prolific writer. Al-Dhahabi said of him: "He was of very high status."