Risalah Arabic (رسـالـة) is the Arabic word for a treatise or philosophical prose within Islam. In Tayyibi Isma'ilism, Rasāʾil Ramaḍāniyya refers to the works composed by the Da'i al-Mutlaq for the most part during the month of Ramadan.

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Each Risalah is essentially divided into two sections: the first contains supplication and eulogy, and the second, a variety of topics that generally conforms to the overarching theme of the Risalah. Each Risalah (epistle) is given a title gematrically equivalent to the Hijri year of its publication:^[1][2] "The context of the quoted texts is not left to the reader to determine, as in the two above-mentioned anthologies. Each text is preceded or followed by a commentary placing it within a specific theme or issue, such as the daʿwa hierarchy under the imams and dāʿīs, the nature of the authority of the dāʿī and the daʿwa dignitaries (ḥudūd), and the role and place of the believers in this world. In addition, each Risāla begins with the traditional introductory taḥmīd, original poems in praise of the Prophet and the imams, and extensive supplications showing a rhetorical mastery of the Arabic language. The Risālas typically end with opinions on legal matters by the author or by previous dāʿīs and daʿwa dignitaries."^[2]