It was narrated from Sahl bin Abi Hathamah that the Prophet forbade selling fruits before their condition was known, but he granted a concession allowing 'Araya sales by estimate, so its people could eat fresh dates.
Reference: Sunan an-Nasa'i 4542 In-book : Book 44, Hadith 94 English translation : Vol. 5, Book 44, Hadith 4546
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