[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.
[16] In particular, the Tawḥīd al-Mufaḍḍal/Kitāb al-Dalāʾil contains the same emphasis on the idea that God, who already in the De mundo is called "one", can only be known through the wisdom permeating his creative works, while his own essence (kunh) remains hidden for all.