Keeping the beard for Muslim men is considered both a prophetic sunna and a wajib act. According to a widely-reported hadith the Prophet said: "Let the beard grow and trim the mustaches". Other traditions bring similar meanings too. Shaving the beard with no valid reasons, like medical necessity or coercion, is therefore considered haram. Some mujtahids have said that beard should not be shaved as "ihtiyat wujubi" (obligatory precaution) which substantially does not much differ from a clear prohibition.
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