Buying the commodity and delaying its delivery and selling it before taking possession

Question:
The questioner asks: What is the ruling on buying the second item by way of preference? Does the questioner pay for the first item and part of the second? It is known that the questioner does not pay for the third item except ten percent of the result of the first item, and he does not know about the first item without renewing the capital.

Answer:
He does not buy from him; rather, he must know the item and be aware of all its details, and buy it for a price that is due immediately, or for a specified price, whether designated or not. As for taking possession of it and the fact that taking possession is delayed, there is no harm in that according to the condition. The taking of possession occurs according to the condition agreed upon between the contracting parties. However, it is not permissible for him to sell it until he has taken full possession of it and knows it completely.