The Masjid is not allowed for the menstruating Woman or the sexually impure person

Question:

A woman's flow of menstrual blood began while she was inside the Masjid of the Messenger of Allah. So, she remained in the Masjid a short while until her family finished praying and then she left out with them, Has she committed a sin in doing this?

Answer:

If she was not able to go out alone, then there is no sin upon her. However, if she was able to go out alone, then it is obligatory upon her to leave in a hurry, because it is not permissible for the menstruating woman, the woman with postnatal bleeding and the sexually impure person to sit (or stay)in the Masjids. This is due to Allah's statement:
"Nor a sexually impure person,except when traveling on the road (without enough water,or just passing through a mosque)." (An-Nisa' 4:43)

This is also due to what was reported from the Prophet that he said:

"Verily,I do not permit entry to the Masjid for the menstruating woman nor the sexually impure person." (Abu Dawud no. 232)

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