Yahya related to me from Malik from Nafi from Abdullah ibn Umar that the Messenger of Allah, may Allah bless him and grant him peace, forbade muzabana. Muzabana was selling fresh dates for dried dates by measure, and selling grapes for raisins by measure.
Muwatta Malik Book 31, Hadith 23
← Previous Hadith Yahya related to me from Malik from Abdullah ibn Yazid that Zayd ibn Ayyash told him that he had once asked Sad ibn Abi Waqqas about selling white wheat for a type of good barley. Sad asked him which was the better and when he told him the white wheat, he forbade the transaction. Sad said, "I heard the Messenger of Allah, may Allah bless him and grant him peace, being asked about selling dried dates for fresh dates, and the Messenger of Allah, may Allah bless him and grant him peace, said, 'Do the dates diminish in size when they become dry?' When he was told that they did, he forbade that."

Muwatta Malik Book 31, Hadith 22 Next Hadith → Yahya related to me from Malik from Da'ud ibn al-Husayn from Abu Sufyan, the mawla of Ibn Abi Ahmad, from Abu Said al-Khudri that the Messenger of Allah, may Allah bless him and grant him peace, forbade muzabana and muhaqala. Muzabana was selling fresh dates for dried dates while they were still on the trees. Muhaqala was renting land in exchange for wheat.

Muwatta Malik Book 31, Hadith 24