Book of Sales and Related Matters

Question: Is it permissible to enter a “lottery”?

Question: A man buys fuel at a station; the attendant sometimes sells to some customers “behind the meter.” Later the buyer who purchased that way regrets it and wants to clear his liability. What is due from him?

Question: What is the evidence for stipulating that the item sold be specified, without stipulating the same for the price?

Question: What is the evidence that indicates dividing sales into valid, corrupt, and void; and (the evidence) for the establishment of “option” (khiyār) in some sales? And what is the difference between that which entails corruption and that which entails...

Question: The hadith narrated by Zayd ibn ʿAlī (peace be upon him): “Whoever sells and buys … up to his saying: has sunk into usury, then sunk into it”—is this intended of everyone who sells and buys, even a small...