Description of the Prayer from Its Beginning to Its End
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 46
لِقَوْلِ أَبِي جَعْفَرٍ اَلثَّانِي عَلَيْهِ اَلسَّلاَمُ: «لاَ بَأْسَ أَنْ يَتَكَلَّمَ اَلرَّجُلُ فِي صَلاَةِ اَلْفَرِيضَةِ بِكُلِّ شَيْءٍ يُنَاجِي بِهِ رَبَّهُ عَزَّ وَ جَلَّ.
The saying of Imam Muhammad ibn Ali Al-Jawad عليه السلام: "There is no harm if a person speaks in the obligatory prayer with anything by which he converses with his Lord عز وجل, Mighty and Majestic."
- Ṣaḥīḥ al-Faqīh