Abstract: Collection of two treatises on uṣūl al-dīn. The first is entitled Mukhtaṣar uṣūl al-dīn in the ms. and is identical with al-Masāʼil al-khamsūn fī uṣūl al-dīn. The second, Ithbāt al-wājib, is dedicated to Ḥasan Pāshā (see fol. 22a), and is identical with Risālah fī Mabdaʼ al-awwal wa-ṣifātih (Kash al-ẓunūn. Ed. Fluegel, III, 437). Both titles appear in the ms.Binding note: Brown leather over pasteboards for upper and lower covers and envelope flap. Gold-stamped central mandorla with two pendants on the vertical axis with an outer frame made of a gold running pattern and a single fillet on upper and lower covers. Similar outer frame on the envelope flap with a small stamp on its pointe.Contents: 1. fol. 2b-18b: Mukhtaṣar uṣūl al-dīn / Fakhr al-Dīn al-Rāzī.Contents: 2. fol. 20b-76a: Ithbāt al-wājib or: Risālah fī mabdaʼ al-awwal wa-ṣifatih / Ḥusayn al-Khalkhālī.Ms. codex.Title from note on fol. 1a (see also fol. 2a). The second title is crossed out, with the mention "Risālah fī mabdaʼ al-awwal wa-ṣifātih lil-Khalkhālī" added by another hand.Text 1 is written in small nastaʻlīq in black ink with use of red, 21 lines to the page, on glazed European paper with watermark, with marginal annotations by the same hand as the main text. Text 2 is written in medium small nastaʻlīq in black ink with use of red, with a frame made of gold, black and blue lines and an illuminated headpiece (ʻunwān) in blue and gold (fol. 20b), 11 lines to the page, on glazed paper, with marginal annotations by the same hand as the main text. Inscription in Arabic script on a label pasted on the upper cover: "ʻAqāʼid 19". Inscription in Arabic script on a label pasted on the pastedown of the upper cover: "ḥāʼ 91".Collation: Paper, fol. 78 ; 1¹⁶ 2⁴ 3-8⁸ 9⁸ (+2, fol. 77-78) ; catchword on the verso of each leaf.