Is it Permissible for a Menstruating Woman to Enter the Mosque?!

It is not permissible for a woman in the period of menses or a Junub (person in a state of post-sexual ritual impurity) to stay in the mosque or to stay in its sections attached to it, based on the hadith by the Prophet, Peace Be upon Him: 'I do not make the Masjid lawful for a menstruating woman or a Junub.' Related by Abu Dawud, rated as Sahih by Ibn Khuzaymah. However, it is permissible to quickly pass through the Masjid if necessary and no impurity will taint the Masjid if necessary and no impurity will taint the Masjid. Allah (Exalted be He) says,  ...nor when you are in a state of Janâba, (i.e. in a state of sexual impurity and have not yet taken a bath) except when travelling on the road (without enough water, or just passing through a mosque)

However, it is permissible to quickly pass through the Masjid if necessary and no impurity will taint the Masjid. Allah (Exalted be He) says,  "…except when travelling on the road (without enough water) or just passing through a mosque." A menstruating woman has the same ruling as a Junub, because the Prophet (peace be upon him) ordered 'Aishah to fetch his prayer rug from the mosque although she was in menses.

Refer to Fatawa al-Lajnah al-Da'imah -2 (5/260)