Sahih Muslim Book 10, Hadith Number 3711.

Chapter : Forbiddance of al-Mubiqala, and al-Muzabana, and al-Mukhabara and the sale of fruits before their good condition is clear, and al-Mu’awama, i.e., the sale for some years.

Jabir b. Abdullah (Allah be pleased with them) reported Allah’s Messenger (may peace be upon him) forbidding Muzabana and Muhaqala, and Mukhabara, and the sale of fruits until they are ripe. I (the narrator) said to Sa’id (the other narrator): What does ripening imply? He said: It meant that they become red or become yellow and are fit for eating.