Buying a commodity for cash and then selling it on installments at a higher price: What is the ruling on that?

Question:
May Allah reward you. Muhammad Ibrahim, an Egyptian resident in the Kingdom, says: I bought a specific commodity for cash, then sold it to another person on installments, but at a price higher than what I paid for it. What is the ruling on that? May Allah reward you with good.

Answer:
If you have bought the commodity and taken full possession of it, you may sell it for a cash price, a deferred price, or an installment price that is higher than the price you bought it for, or lower, or the same; there is no blame on you in that. Allah the Exalted said: The default in transactions is permissibility, except for what evidence indicates to be prohibited. However, if you sell commodities before you own them and before you take possession of them, and then you go and buy them to deliver them to the one who bought them from you, that is not permissible. The Messenger (peace and blessings be upon him) said: Do not sell what you do not have. Yes.