Ibn 'Umar (Allah be pleased with them) reported Allah's Messenger (ﷺ) having forbidden Muzabana, and Muzabana implies the selling of dry dates for fresh dates on the tree with a definite measure (making it clear) that in case it increases, it belongs to me and if it is less, it is my responsibility.
Reference: Sahih Muslim 1542 e In-book : Book 21, Hadith 96 USC-MSA web (English) : Book 10, Hadith 3697 (deprecated)
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