The meaning of the hadith: “Gold for gold, dates for dates, and barley for barley, hand to hand, equal in amount”?

Question:
May Allah reward you. Honorable Shaykh, we are concluding this episode with this question, in which the questioner asks for clarification of the hadith that says: “Gold for gold, dates for dates, and barley for barley, hand to hand.” We also ask for the completion of the hadith.

Answer:
Yes, equal in amount. This hadith forbids riba (usury or interest) in these six categories. One category must not be increased over another if they are of the same type. If it is a sale of one type for its own type—dates for dates, wheat for wheat, barley for barley, salt for salt, gold for gold, silver for silver, meaning currency for currency—it is not permissible for one to be increased over the other. Rather, they must be equal in amount. If one is increased, it is riba.
As for when the types differ, an increase is permissible, but deferring the transaction is forbidden. The exchange must be completed in the meeting.
So riba is of two types: riba al-fadl (usury of excess in a like-for-like exchange), in which an increase is forbidden and deferral is forbidden. And riba al-nasi'ah (usury of deferment), in which, if the types differ, deferral is permissible, but the exchange must be completed in the meeting, hand to hand. Yes.