Why did hadith scholars travel across the Islamic world to learn reports?

Hadith scholars traveled extensively across the Islamic world primarily to collect, verify, and authenticate reports attributed to the Prophet Muhammad.12

In the early centuries of Islam, as the empire expanded, these reports were dispersed across vast regions. Because forgery and false attribution were significant concerns, scholars sought to ensure the reliability of the traditions they recorded. To do this, they employed a system of verification centered on the isnād—a chain of narrators that linked the report back to the Prophet.21

Traveling allowed scholars to:
* Verify Chains of Transmission: By meeting narrators in person, scholars could confirm the accuracy of the isnād, determine if the transmission was oral or written, and verify whether there was direct contact between the conveyor and the recipient of the hadith.1
* Systematize Knowledge: Scholars aimed to sift out inauthentic or compromised traditions from authoritative ones, a process that required scrutinizing a vast number of reports.12
* Establish Authority: Excellence in hadith scholarship was highly esteemed, and the ability to personally verify reports through travel and study contributed to a scholar's reputation and social standing.3