It is impermissible to
sell the fruit of palm trees, grapes and grains including wheat, barley, corn and suchlike, individually unless they remain on the trees until they are in a good condition. It was authentically reported on the authority of
Ibn `Umar (may Allah be pleased with them both) that:
The Prophet (peace be upon him) forbade the sale of fruits until their condition is known; he forbade the vendor and the buyer to do so.
Moreover, it was authentically reported on the authority of
Zayd ibn Thabit (may Allah be pleased with him) that he said:
During the lifetime of the Prophet (peace be upon him), the people used to sell fruits (before they were clearly in a good condition). When the people cut off the fruit, and were demanded to pay the price, the buyer said: The fruit has been smitten by duman, qusham and murad ... Fruit diseases on which they used to dispute. When the disputes that were brought to the Prophet (peace be upon him) increased, Allah's Messenger (peace be upon him) said to them (as advice): No, do not sell fruit till it is in a good condition.
He offered this advice due to their disputes and differences.
However, it is permissible to sell them before their condition is known as long as they are sold along with their trees and after having been removed from the trees. (Part No. 14; Page No. 83) Its condition becoming known varies from one type to another. As for dates, it is known with the appearance of the red or yellow color on the fruit even if it is only on one part. The whole grain or part of it should be upright. The grapes should turn white or black. May Allah grant us success. May peace and blessings of Allah be upon our Prophet Muhammad, his family and Companions!