Buying and Selling: Selling Ripe Fruit for Unripe Fruit
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 2086
Selling ripe fruit for unripe fruit with extra is not permitted. If there is no extra and the transaction does not have a period, it is disapproved (makrūh), and if it is on credit, it is problematic [i.e. based on obligatory precaution, it is not permitted].
-Ayatullah Sistani, Practical Laws of Islam, Buying and Selling