He wrote in the contract a price higher than that which was paid, and took it from the neighbour

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Check below answers in case you are looking for other related questions:
Buying an item for a certain price and selling it for double the price
Shar’i guidelines on selling by instalments

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Related Answers:
Selling a product at different prices to different customers
Being tolerant of sinner’s sins
Selling discount coupons for gas
Buying an item for a certain price and selling it for double the price
Shar’i guidelines on selling by instalments

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