Someone gave me a free ticket. Is it permissible to sell the ticket?

Answer

If the ticket you are referring to relates to a haraam function, e.g. sports, then you have to tear it up and throw it away. It is haraam to aid and abet in the commission of sin. If the ticket pertains to a halaal matter, e.g. a bus ticket, a plane ticket, etc., then you may not make a profit on it. The profit will not be halaal. You can only give it away free or sell it for the price you had paid.