A recorded lecture by Mostafa Hussein (University of Michigan) that took place at UCLA on Wednesday, April 2, 2025 as part of the CNES Averroës Lecture Series. The lecture explores the shared passion for acquiring and disseminating Arabo-Islamic knowledge that connected a Muslim and a Jew in the first half of the twentieth century. Their common interest in preserving, reproducing, and classifying Arabo-Islamic sources, ranging from books to manuscripts, led Abraham Shalom Yahuda and Muḥammad Amīn al-Khanjī into a decades-long interconfessional ṣuḥba (collegiality/friendship) that encompassed formal and informal mechanisms, bridging the Mediterranean.