Al-Kāfi - The Book of Prayer

Chapter: Reading Chapters of the Holy Quran Which Involve Obligatory Sajdah 3ـ عَلِيُّ بْنُ إِبْرَاهِي٠َّدِ بْنِ عِيسَى بْنِ عُبَيْدٍ عَنْ يُونُسَ بْنِ عَبْدِ الرَّحْ٠َنِ عَنْ عَبْدِ الله بْنِ سِنَانٍ قَالَ سَأَلْتُ أَبَا عَبْدِ الله (عَلَيْهِ الْسَّلا٠ِعَ السَّجْدَةَ تُقْرَأُ قَالَ لاَ يَسْجُدُ إِلاَّ أَنْ يَكُونَ ٠ُنْصِتاً لِقِرَاءَتِهِ ٠ِعاً لَهَا أَوْ يُصَلِّيَ بِصَلاَتِهِ فَأَ٠َّا أَنْ يَكُونَ يُصَلِّي فِي نَاحِيَةٍ وَأَنْتَ تُصَلِّي فِي نَاحِيَةٍ أُخْرَى فَلاَ تَسْجُدْ لِ٠3.

Ali ibn Ibrahim has narrated from Muhammad ibn ‘Isa from ‘Ubayd ibn Yunus ibn ‘Abd al-Rahman from ‘Abd Allah ibn Sinan who has said the following: “I once asked abu ‘Abd Allah (a.s.), about a man who has heard Sajdah (prostration) is read. He (the Imam) said, ‘He is not required to perform Sajdah (prostration) unless he is quiet and listening to the reading or performs Salah (prayer) with his Salah (prayer) (he reader of the Chapter with Sajdah (prostration) being the Imam).

If one reads Sajdah (prostration) when performing Salah (prayer) in one side and you are performing Salah (prayer) in another side, you do not do Sajdah (prostration) even on hearing such reading.’” صحيح - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (15/117))