Sale on credit with an increase: Does it fall under the prohibition of two sales in one sale?

Question:
He says: Honorable Shaykh, may Allah grant you success, does a sale on credit with an increase fall under the prohibition of two sales in one sale?

Answer:
No, the Messenger (peace and blessings be upon him) bought on credit with an increase. He would buy a camel, or take a camel for two camels from the zakat camels, borrowing a camel for two camels from the zakat camels. So, deferring payment with an increase is permissible, and it is among the interests of the people. If the increase in deferred payment were prohibited, sales would be restricted to cash only, and people would lose many of their transactions.