This is called istisnaa and it is having something made for you with well known specifications and description with an advanced payment and a defined time of delivery. This is permissible. What is not permissible is to sell something that is specific and known; for example: my friends car which I don’t own and have no prior authority of selling it, i say to you I sell it for so and so!

Regarding latest question: u cant sell something u dnt own. resellers- who buy from the company at factory rates and then sell it to customer by adding own profit.All the furniture resellers only order when the customer orders and pays atleast 50% of money.dey dnt own it (becoz its not even made yet) they use customers money to order frm company.u said its not permissible?

Islamic economy | August 4, 2015 2:19 am
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I have a garage; man comes to get his car repaired. It requires parts which I have to buy and this requires me to spend time, effort, transportation etc. So I tell him that the parts will cost him 1000 Dirhams, and he agrees – but I know that the parts will cost only 800 Dirhams. What is the ruling on the extra money that I charged him?
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Al-Rajhi bank follows islamic law, but if they give me a credit card, then is it haraam or halal ?