Sales in which a Price is paid for Goods to be Delivered Later (As-Salam)
Bukhari :: Book 3 :: Volume 35 :: Hadith 448
Narrated Muhammad bin Abi Al-Mujalid:
as above (446) and said, "We used to pay them in advance for wheat and barley (to be delivered later). Narrated Ash-Shaibani--"And also for oil."
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