Sales in which a Price is paid for Goods to be Delivered Later (As-Salam) -
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." Narrated Ash-Shaibani: who said "We used to pay in advance for wheat barley and dried grapes."
AI Summary
The key points are:
The Prophet Muhammad came to Medina and the people used to pay in advance for goods to be delivered later. The Prophet said that whoever pays in advance should pay for a specified measure, weight, and period of time. This type of transaction is referred to as as-salam.