Is it permissible to bet money on attending Fajr prayer in the mosque?
Your statement to your brother: "If you come to the mosque for Fajr at a certain time, you will have such and such from me" falls under the category of a promise, and fulfilling it is permissible if it is easy to do so.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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