Selling vegetables in wholesale though knowing that farmers cheat in them

Q 3: There is a vendor who deals with farmers and they behave dishonestly. They put the large fruit on top and the small ones at the bottom before giving them to the vendor to sell. He knows that they are deceptive. What should he do with them? Are these farmers sinful?

A: The vendor has to advise and warn the farmers against behaving like this. He is also obliged to tell the people to whom he sells the products about their defects, or he is also considered sinful. May Allah grant us success. May peace and blessings of Allah be upon our Prophet Muhammad, his family and Companions!