A large number of religious books bear al-Sadiq's name as their author, but none of them can be attributed to al-Sadiq with certainty. It has been suggested that al-Sadiq was a writer who left the work of writing to his students. In this regard, some of the works attributed to
Jabir ibn Hayyan () also claim to be mere expositions of al-Sadiq's teachings. A Quran commentary (), a book on divination (
Ketb al-Jafr), numerous drafts of his will, and several collections of legal dicta are among the works attributed to al-Sadiq.
Exegesis Most of the extant writings attributed to al-Sadiq are commentaries () on the
Quran: in Sufi circles, a number of mystical Quranic exegeses are attributed to al-Sadiq, such as
Tafsir al-Quran, ''Manafe' Sowar al-Quran
, and Kawass al-Quran al-Azam''. Another attributed work is the book of , a mystical commentary which according to
Ibn Khaldun was written by al-Sadiq about the hidden () meanings of the Quran. According to Ibn Khaldun this book was transmitted from al-Sadiq and written down by Hārūn ibn Saʿīd al-ʿIjlī. Perhaps the most influential mystical exegesis attributed to al-Sadiq is the , composed by Abū ʿAbd al-Raḥmān al-Sulamī (d. 330/942). This text was first introduced to modern scholarship by
Louis Massignon, and was later published in a critical edition by Paul Nwyia. Another version was published by ʿAlī Zayʿūr. One of the outstanding features of this exegesis is its emphasis on letter mysticism. It is considered to be the oldest mystical commentary of the Quran after
Sahl al-Tustari's exegesis.
Tafsīr al-Nuʿmānī is another exegesis attributed to al-Sadiq, which he supposedly narrated on the authority of
Ali from
Muhammad. This treatise was compiled by Muhammad ibn Ibrahim al-Nu'mani – known as Ibn Abi Zainab. The 17th-century scholar
Mohammad-Baqer Majlesi recorded it in his . A summary of it has also been attributed to the Twelver theologian
Sharif al-Murtaza and was published under the title .
Tafsīr al-Imām al-Ṣādiq is another commentary attributed to al-Sadiq, which
Agha Bozorg Tehrani mentions it in his book al-Dharī'a under the title ''Tafsir al-Imam Ja'far bin Muhammad al-Sadiq'' and it is believed that one of Sadiq's students narrated it from him.
Fuat Sezgin calls this work
Tafsīr al-Qurʾān. A copy of it with the title
Tafsīr al-Imām al-Ṣādiq, according to
Bankipur Oriental Library's catalogue, is written by al-Nuʿmānī based on the sayings of al-Sadiq. This commentary is arranged according to the
Surahs of the Quran and covers only the words of the Quran that require explanation. This commentary, which is a type of mystical commentary, deals with both the exoteric (ẓāhir) and the esoteric (bāṭin) aspects of the Quran. It is mostly about God and his relationship with mankind, also man's knowledge of God and the relationship between Muhammad and God.
Tawhid al-Mufaddal The ('Declaration by al-Mufaddal of the Oneness of God'), also known as the ("Book on the Beginning of Creation and the Incitement to Contemplation"), is a ninth-century treatise concerned with proving the
existence of God, attributed to Ja'far al-Sadiq's financial agent
al-Mufaddal ibn Umar al-Ju'fi (died before 799). The work presents itself as a dialogue between al-Mufaddal and Ja'far al-Sadiq, who is the main speaker. Like most other works attributed to al-Mufaddal, the was in fact written by a later, anonymous author who took advantage of al-Mufaddal's status as one of the closest confidants of Ja'far al-Sadiq in order to ascribe their own ideas to the illustrious
Imam. However, it differs from other treatises attributed to al-Mufaddal by the absence of any content that is specifically Shi'i in nature, a trait it shares with only one other Mufaddal work — also dealing with a rational proof for the existence of God — the ("Book of the
Myrobalan Fruit"). Though both preserved by the 17th-century Shi'i scholar
Muhammad Baqir al-Majlisi (died 1699), the only thing that connects the and the to Shi'ism more generally is their ascription to Ja'far al-Sadiq and al-Mufaddal. Rather than by Shi'i doctrine, their content appears to be influenced by
Mu'tazilism, a rationalistic school of Islamic speculative theology (). Both the and
pseudo-Jahiz's likely go back on an earlier 9th-century text, which has sometimes been identified as the ("Book of Thought and Contemplation") written by the 9th-century
Nestorian Christian Jibril ibn Nuh ibn Abi Nuh al-Nasrani al-Anbari. The
teleological argument for the existence of God used in the is inspired by
Syriac Christian literature (especially commentaries on the
Hexameron), and ultimately goes back on
Hellenistic models such as the
pseudo-Aristotelian ("
On the Universe", 3rd/2nd century BCE) and
Stoic theology as recorded in
Cicero's (106–43 BCE) .
Other works Misbah al-Sharia and Miftah al-Haqiqah is another work attributed to al-Sadiq. It is on personal conduct, with chapters on various topics such as legal interests interspersed with general moral issues, and advice on how to lead a spiritual life and thus purify the soul. As the first person who came across this book in the 7th century A.H.,
Sayyed Ibn Tawus described it as a collection of
hadiths of Jafar al-Sadiq. It includes a prediction of future events and sufferings. There is a specific Shia chapter in "Knowledge of the Imams" in which the names of
all the Imams (both before al-Sadiq and after him) are mentioned during the exchange of reports between
Muhammad and
Salman the Persian.
Mohammad Baqer Majlesi considered this work to have been written by
Shaqiq al-Balkhi, who supposedly quoted it from "one of the people of knowledge", and not explicitly from Ja'far al-Sadiq. Despite Majlesi's doubts about its authenticity, this work remains very popular as a manual of personal worship and has been the subject of a number of commentaries by prominent Shia and Sufi scholars. It has also been translated into different languages. Its manuscript is available in the library of
Gotha. There is also a book on dream interpretation that is attributed to al-Sadiq and is known by the name
Taqsim al-roʾyā. It is identical to the work
Ketāb al-taqsim fi taʿbir al-ḥolm, which is credited to Ja'far al-Sadiq. Eighty various types of dream sightings, ranging from the religious (dreams of God, angels, prophets, and imams) to the profane (dreams of meat, fat, and cheese), are interpreted by Ja'far al-Sadiq in this book. According to Robert Gleave, it is not always clear whether they can be regarded as works attributed to Jafar al-Sadiq or works attributed to
Ali ibn Abi Talib that is transmitted through Ja'far al-Sadiq. From a Shia perspective, this is not problematic because there is no discernible difference between the knowledge of one imam and that of another from a religious perspective. The
Kitāb al-Ihlīlaja is presented as al-Sadiq's opinions transmitted through al-Mufaddal. The work is allegedly a response to al-Mufaddal's request for a refutation of atheists. Jafar al-Sadiq describes his own argument with an atheist Indian doctor in it. The discussion took place as the doctor prepared a
myrobalan plant-based medication (known in Arabic as
Ihlīlaj, and hence the title of the work). == Shia disciples ==