وإذا وجدا حرم التفاضل والنساء
Translation: Where both attributes are present, inequality and deferment are both prohibited.
Gold for gold, or wheat for wheat, contains both operative attributes. Two distinct restrictions follow:
1. The quantities must be equal.
2. The relevant exchange cannot be deferred.
Exchanging 10 g of gold today for 10 g next week is impermissible even though the weights match. Exchanging 10 g for 11 g immediately is also impermissible. The two violations are analytically distinct.