What is the ruling on selling a commodity at a deferred price, payable after its sale to a third party, then the initial buyer sells it to a second party at a higher price, and then pays the original owner the due amount?

It is permissible to sell goods for a deferred price to someone who buys them and then sells them to pay off the debt, provided that the buyer takes possession of the goods and moves them from the seller's premises before selling them to another. There is no specific limit on profit in Islamic law, so it is permissible to sell goods for double their price, as long as the seller does not exploit the buyer's heedlessness or ignorance of prices.