Five things are unlawful for a junub: 1. touching the writing of the Qur’an or the name of Allah the Exalted with any part of the body as per the details that were mentioned in the section on wuḍūʾ;[1] 2. entering Masjid al-Ḥarām and the Mosque of the Prophet (Ṣ), even to the extent of entering from one door and exiting from another; 3. staying in other mosques; and similarly, based on obligatory precaution, staying in the shrines of the Infallible Imams (ʿA).
However, there is no problem if a junub passes through a mosque; for example, by entering from one door and exiting from another; 4. entering a mosque to take something from it; and similarly, based on obligatory precaution, placing something in it even if he does not enter the mosque himself [but places something in it from outside]; 5. reciting any of the verses for which sajdah is obligatory. These verses are found in four chapters (surahs) of the Qur’an: a.
Sūrat al-Sajdah (Chapter 32), verse 15; b. Sūrat Fuṣṣilat (Chapter 41), verse 37; c. Sūrat al-Najm (Chapter 53), verse 62; d. Sūrat al-ʿAlaq (Chapter 96), verse 19. [1] See