Dala'il al-I'jaz

Dalā'il al-I'jāz fī al-Qur'ān (Arabic: دلائل الإعجاز في القرآن, romanized: The Proofs of Inimitability in the Qur'ān) is a foundational work of Arabic literary theory and Arabic rhetoric written by the 11th-century Persian-born grammarian and theorist 'Abd al-Qāhir al-Jurjānī (d. 1078 CE / 471 AH). It is widely regarded as a pioneering text in the field of ʿilm al-balāgha (Arabic rhetorical science), and a cornerstone in the study of the inimitability of the Qur'ān (I'jāz al-Qur'ān).

Written in the city of Jurjān, the treatise presents a radical linguistic theory that redefined how eloquence (faṣāḥa) and literary power are understood. Its influence extended across disciplines such as Qur'anic exegesis (tafsir), grammar (naḥw), semantics, and classical poetics, and helped formalize rhetoric as a scientific discipline in the Islamic world.