ومن باع نخلا أو شجرا فيه ثمر فثمرته للبائع إلا أن يشترطها المبتاع
Translation: If a date palm or another tree carrying fruit is sold, the fruit belongs to the seller unless the buyer stipulates its inclusion.
This clause concerns fruit already present on the tree at the time of sale. Selling the tree does not automatically convey the existing fruit.
The exception, unless the buyer stipulates it, means the fruit can be brought within the bargain by a clear term. Without that term the existing fruit remains the seller’s.