Prayer: The Obligatory Sajdah of Recitation
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 1079
In each of the four surahs al-Sajdah, Fuṣṣilat, al-Najm, and al-ʿAlaq, there is a verse of sajdah,[1] which means that if one recites this verse or listens to it, he must immediately perform sajdah after the verse has finished. If he forgets to do this, he must perform sajdah whenever he remembers. Performing sajdah is not obligatory if one hears such a verse involuntarily, although it is better that he does.
-Ayatullah Sistani, Practical Laws of Islam, Prayer (Salah)
1
In Sūrat al-Sajdah (Chapter 32), the verse is number 15; in Sūrat Fuṣṣilat (Chapter 41), it is verse 37; in Sūrat al-Najm (Chapter 53), it is verse 62; and in Sūrat al-ʿAlaq (Chapter 96), it is verse 19.