"I heard Ibn 'Umar say: 'We used to sell grain before it was ripe and before it was evident that it was free of disease and blight (by means of Al-Mukhabarah). We did not see anything wrong with that, until Rafi' bin Khadij said that the Messenger of Allah had forbidden Al-Mukhabarah.'"
Reference: Sunan an-Nasa'i 3917 In-book : Book 35b, Hadith 61 English translation : Vol. 4, Book 35, Hadith 3948
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