Sibawayh's Al-Kitāb is a monumental and foundational work in Arabic linguistics, representing the earliest comprehensive treatise on Arabic grammar. Written by the Persian grammarian Sibawayh in the 8th century, it meticulously details the morphology, syntax, and phonology of classical Arabic, establishing many of the principles that would define the study of the language for centuries. This particular edition, presented as Part One, is a critical edition that enhances the original text with valuable marginal notes. It also incorporates excerpts and key points from the extensive commentary by Abu Sa'id al-Sirafi, offering additional layers of scholarly insight and interpretation, making it an indispensable resource for students and researchers of Arabic language and Islamic studies.