Ruling on what is called a “promise to buy”

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Check below answers in case you are looking for other related questions:
Ruling on selling an item that is not in the seller’s possession, and ways of correcting this way of doing business
It is not permissible to buy a product then sell it when it is still in the warehouse of the first vendor, before it has been moved

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Related Answers:
Ruling on using points offered by airline companies
Making down-payments
If the seller claims that he made a mistake about the price of the item, does the purchaser have to pay the difference?
Ruling on selling an item that is not in the seller’s possession, and ways of correcting this way of doing business
It is not permissible to buy a product then sell it when it is still in the warehouse of the first vendor, before it has been moved

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