© The Author. Published by Oxford University Press on behalf of the Oxford Centre for Islamic Studies. All rights reserved. For Permissions, please email: [email protected] handsomely produced volume is the ninth of the OUP-IIS series titled Epistles of the Brethren of Purity. Inaugurated in 2008, the series is designed in part to replace several older Arabic editions of Rasāʾil Ikhwān al-Ṣafāʾ that have been published over the decades but which failed to identify their manuscript sources. Nineteen manuscripts in all were (...) used to reconstruct the basic text, with some significant variations. The fact is that the Rasāʾil enjoy no exact dating and contain internal inconsistencies. The best estimate for their initial dissemination goes as far back as the time of ʿAbbasid caliph al-Maʾmūn. Therefore, the main contribution of this series is that it puts a semblance of order to... (shrink)