Hakim asked (the Prophet): Messenger of Allah, a man comes to me and wants me to sell him something which is not in my possession. Should I buy it for him from the market? He replied: Do not sell what you do not possess.
Reference: Sunan Abi Dawud 3503 In-book : Book 24, Hadith 88 English translation : Book 23, Hadith 3496
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