This is prohibited and a form of gambling.

Is it permissible? We give $30 each with the goal to lose 4% of body weight in 4 weeks. The money is kept in a pot collected by the company who hosts game. 4 weeks later the winners among us share the money. The company takes 10-25% of the total money collected. Those who didn’t lose enough weight or gave up don’t get anything. If everybody loses weight we simply get our $30 back

Halal/Haram Matters | July 4, 2017 5:39 pm
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Can normal Muslims judge other Muslims? For example, if someone does something wrong which is directly in contradiction with Islam? In this case, by judge, I mean saying if the act is wrong or right and give the person advise. Is it permissible to point out one’s wrong on Internet if the person is out of reach? Please answer my question in the light of Quran and hadith.
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My sister gave her niece a gold set as wedding gift when she got engaged. The engagement broke and no wedding took place. Six years have passed and her niece is still not married. My sister now wants her gift back as she says since she didn’t get married she can take it back. Is this permissible.