What say the muftis of the eminent Shariah about an issue where I purchase merchandise from wholesale market and then I sell it in the retail stores. Sometime some products are sold very cheep, some people say that these products are cheap because it’s stolen. So, in such a case would it be permissible to buy and sell such merchandise?

Until it’s not verified that the merchandise is stolen the business transactions with such products is permissible. What people say (in this case rumors) would not be accounted as a valid reason.
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