The ruling on selling a described commodity in the debt before taking possession of it

Question:
Some people may be found in places where they take orders for companies abroad, giving them the deals without the commodity being in their possession, and then, once they receive the price, they begin importing the commodity. Is this sale permissible, even if the commodity is described in a way that leads to ambiguity?

Answer:
Yes, it is permissible to sell a described commodity in the debt with a description that eliminates ambiguity; there is no harm in it. However, the condition is that the price must be paid in the session of the contract. If the price is not paid in the session of the contract, it is not permissible, because it would be a sale of debt for debt: the price is a debt and the item sold is a debt. This is what is not permissible. The Prophet (peace and blessings be upon him) prohibited . Selling kaly by kaly is selling debt for debt. If one buys a described commodity in the debt, such as twenty cars or a hundred cars of a certain model, to be delivered to him, this is valid and permissible, but on the condition that you pay the entire value in the session of the contract.
And when the cars arrive, you go and take delivery of them. If they match the descriptions, you take them; otherwise, you say, "No, bring me others that match the description." Yes.