It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) forbade the sale of Muzabanah. Muzabanah means selling dates that have been cut for dates that are still on the trees, and selling grapes for raisins, by estimation.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 5297
Hadith Gradingحکم دارالسلام:إسناده صحيح ، خ : 2171 ، م : 1542 .