The Ruling on Masturbation During the Daytime of Ramadan
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Question: A young man masturbated during the day while fasting. What is obligatory for him?
Answer: Masturbation during the daytime of Ramadan invalidates the fast if he did so intentionally and semen was emitted. He must make up the fast if it was an obligatory fast, and he must repent to Allah (Glorified and Exalted is He); because masturbation is not permissible, neither in the state of fasting nor otherwise. This is what people call the secret habit.
Answer: Masturbation during the daytime of Ramadan invalidates the fast if he did so intentionally and semen was emitted. He must make up the fast if it was an obligatory fast, and he must repent to Allah (Glorified and Exalted is He); because masturbation is not permissible, neither in the state of fasting nor otherwise. This is what people call the secret habit.
Source
binbaz.org.sa
The Arabic text is copied verbatim from the original source, without any edits.