You must always refer to the Quran and sunnah through the understanding of the salaf! This can happen only if you read their books on aqeedah such as the books of Ibn Taimiyah and Ibn Alqayyem.

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In Islam Prophet (saw) forbade hair cut like Jews and Christians where they shave the sides and keep the line of hair in between, if you mean like this it is not allowed. Normal hair cut like everyone else with little difference in length is permissible in Sha Allah .

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