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Bibliotheca Islamica (BI) is the Orient-Institut Beirut’s platform for the critical edition of mainly Arabic texts. The series dates back to 1929, when Hellmut Ritter edited the Kitāb Maqālat al-islamīyīn wa-ḫtilāf al-muṣallīn of Abū l-Ḥasan ʿAlī al-Ašʿarī, a seminal text on dogmatic positions in the early Islamic period. Since then, the OIB has published more than fifty titles in this series.