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.
Hadith ReferenceSunan an-Nasa'i / The Book of Financial Transactions / Hadith: 4546
Hadith Gradingالألبانی:صحيح ق دون قوله حتى يبدو صلاحه | زبیر علی زئی:متفق عليه