Ruling on selling an item on credit for a higher price than if it is paid for immediately

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What is the ruling on buying from the kuffaar when there are Muslims around?
Taking a sample of clothing from a store and making something similar with the intention of selling it

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Related Answers:
It is haraam to sell an item without pointing out its faults, even if he is selling it to a kaafir
Ruling on what is called a “promise to buy”
Raising the price of a piece of land in return for transferring a government loan to the purchaser
What is the ruling on buying from the kuffaar when there are Muslims around?
Taking a sample of clothing from a store and making something similar with the intention of selling it

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