The Messenger of Allah (ﷺ) as saying: If anyone buys grain, he should not sell it until he measures it. Abu Bakr added in his version: I asked Ibn 'Abbas: Why ? He replied: Do you not see that they sell (grain) for gold, but the grain is still with the seller.
Reference: Sunan Abi Dawud 3496 In-book : Book 24, Hadith 81 English translation : Book 23, Hadith 3489
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