An important book by Ibn al-Sid, that discusses the differences between the five letters (Ḍad, Ḍuwad, Ṣad, Ḍal, and Sin) that many people make mistakes with, not to mention the common people. The book is divided into five chapters, each of which includes questions and examples related to the pronunciation of these letters.

By the Andalusian grammarian and philosopher, Abu Muḥammad Abd Allah ibn Muḥammad ibn al-Sid al-Baṭalyawsi (444/1052 - 521/1127) (also known as Ibn al-Sīd al-Batalyawsī & Ibnu as-Sayyid al-Bathalyusi & Abenalsid).

With research and editing of Dr. Hamzah Abd Allah Nashrati.