When you purchase foodgrains, do not sell them until you have taken possession of them.
Sahih Muslim Book 21, Hadith 49
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Have you made lawful the transactions involving interest? Thereupon Marwan said: I have not done that. Thereupon Abu Huraira (ﷺ) said: You have made lawful the transactions with the help of documents only, whereas Allah's Messenger (ﷺ) forbade the transaction of foodgrains until full possession is taken of them. Marwan then addressed the people and forbade them to enter into such transactions (as are done with the help of documents). Sulaiman said: I saw the sentinels snatching (these documents) from the people.
Sahih Muslim Book 21, Hadith 48 Next Hadith → Jabir b. Abdullah (Allah be pleased with them) is reported to have said that Allah's Messenger (ﷺ) forbade the sale of a heap of dates the weight of which is unknown in accordance with the known weight of dates.
Sahih Muslim Book 21, Hadith 50
Sahih Muslim Book 21, Hadith 48 Next Hadith → Jabir b. Abdullah (Allah be pleased with them) is reported to have said that Allah's Messenger (ﷺ) forbade the sale of a heap of dates the weight of which is unknown in accordance with the known weight of dates.
Sahih Muslim Book 21, Hadith 50