Selling Wheat for Rice with Deferred Payment

The questioner:
The Shaykh's son rules that among the greatest of them is to take possession of land during the siege.

The Shaykh:
Whoever gives wheat to be delivered as rice at harvest, this is forbidden; it is not permissible. This is a sale. If these types differ, sell however you wish if it is hand-to-hand. If he sells barley for rice, the exchange of possession is required. Exchanging different amounts is permissible; he may sell ten sa' of barley for twenty sa' of rice, which is permissible due to the difference in type, but the exchange of possession in the meeting is required. If he sells barley for rice on a deferred basis, this is riba (usury or interest) and is not permissible.

Another questioner:
Definitely.

The Shaykh:
He says it is deferred; the delay is called nasi'ah.