The Messenger of Allah (ﷺ) as saying: If anyone buys a grain, he should not sell it until he takes possession of it. Sulaiman b. Harb said: Until he receives it in full. Musaddad added: Ibn 'Abbas said: And I think that everything is like grain.
Reference: Sunan Abi Dawud 3497 In-book : Book 24, Hadith 82 English translation : Book 23, Hadith 3490
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