Because oil was scarce at the time

Reference: https://twitter.com/almoslem70/status/942496015852228608
https://twitter.com/almoslem70/status/942496015852228608

I heard Shaykh Saalih al-‘Usaymee relate:

Most of what Shaykh Ja’far al-‘Atamee read [in the seeking] of knowledge was by way of the moonlight, because oil was scarce at the time.

He is a graduate of the Islaamic University of Madeenah, having graduated from the Institute of Arabic Language, and later the Faculty of Sharee'ah in 2004. He currently resides in Birmingham, UK.

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