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Sales in which a Price is paid for Goods to be Delivered Later (As-Salam) - Sunnah.com - Sayings and Teachings of Prophet Muhammad (صلى الله عليه و سلم)
From Sahih al-Bukhari - Sunnah.com - Sayings and Teachings of Prophet Muhammad (صلى الله عليه و سلم) by Sahih El Boukhari