Istinshaq is drawing water into the soft inner portion of the nose; washing its exterior is not a substitute. This too is obligatory in Hanafi ghusl.
It need not be done with force that causes harm. Mouth rinsing and nasal rinsing are distinct obligations.
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Ghusl: Obligations, Sunnah Procedure and Braided Hair
Istinshaq is drawing water into the soft inner portion of the nose; washing its exterior is not a substitute. This too is obligatory in Hanafi ghusl.
It need not be done with force that causes harm. Mouth rinsing and nasal rinsing are distinct obligations.