[3] 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 Kitāb al-Ihlīlaja ('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 Tawḥīd al-Mufaḍḍal and the Kitāb al-Ihlīlaja to Shi'ism more generally is their ascription to Ja'far al-Sadiq and al-Mufaddal.
[2] The Tawḥīd al-Mufaḍḍal is a revised version of a work falsely attributed to the famous Mu'tazili litterateur al-Jahiz (died 868) under the title Kitāb al-Dalāʾil wa-l-iʿtibār ʿalā al-khalq wa-l-tadbīr ('Book of Proofs and Contemplation on Creation and Administration').
It consists of a series of lectures about the existence and oneness (tawḥīd) of God presented to al-Mufaddal by Ja'far al-Sadiq, who is answering a challenge made to him by the self-declared atheist Ibn Abi al-Awja'.
Instead, it is a revised version of a work also attributed to the famous Mu'tazili litterateur al-Jahiz (died 868) under the title Kitāb al-Dalāʾil wa-l-iʿtibār ʿalā al-khalq wa-l-tadbīr ('Book of Proofs and Contemplation on Creation and Administration').
[11] Compared to pseudo-Jahiz's Kitāb al-Dalāʾil, the Tawḥīd al-Mufaḍḍal adds an introduction that sets up the frame story involving al-Mufaddal, Ibn Abi al-Awja', and Ja'far al-Sadiq, as well rhymed praises of God at the beginning of each chapter, and a brief concluding passage.
Twelver Shi'is generally rejected the ideas of the ghulāt, but al-Mufaddal was important to them as a narrator of numerous hadiths from the Imams Ja'far al-Sadiq and his son Musa al-Kazim.