Salam in the Sale of Gold

The questioner:
He says: Honorable Shaykh, may Allah grant you success, is salam (a forward sale paid in advance) permissible in the sale of gold?

The Shaykh:
Is it permissible?

The questioner:
Salam in the sale of gold?

The Shaykh:
No, if it is in dirhams, it is not permissible. However, if the price is not in dirhams and the item being sold is gold or silver, there is no harm if the type differs. If the type and the operative cause differ, then excess in the exchange and deferment are permissible. If the type is the same but the operative cause differs, then excess is permissible, but deferment is not. If the type is the same... Remember this rule, and it will be resolved for you, if Allah wills. If the type and the operative cause are the same, excess and deferment are forbidden. If the operative cause is the same but the type differs, excess is permissible, but deferment is not. If the type and the operative cause differ, both excess and deferment are permissible.