The Ruling on Staying in the Masjid While Menstruating

Question:

Can  women go to a mosque that used to be a church building a long time ago,
whilst menstruating?

Thanks

Answer:

الحمد لله رب العالمين ، وصلى الله على سيدنا محمد وعلى آله وصحبه أجمعين، وبالله التوفيق

يحرم على المرأة دخول المسجد فى حالة الحيض وإن كان ذلك المسجد من أصل الكنيسة لأن الحكم تبدل بتبدل الماهية فصارت الكنيسة الآن فى حكم المسجد بعد جعلها ونيتها مسجدا والامور بمقاصدها ..

It is prohibited for a woman to enter a masjid (mosque) while menstruating, even though, the masjid (mosque) was originally a church.
This is because the hukm (law) of something changes by the change of its nature. So the church now takes the ruling of a masjid after it was made to be a masjid and because it is intended to be a masjid, and matters are judged based upon what is intended, (al-Ashbah: 38).

والله أعلم وعلمه أتم

Answered by:

Al-Ustadh Abdul Fattah al-Shāfiʿī

Kubang Bujuk, Malaysia