Congregational Prayer and Its Virtue
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 57
وَ رَوَى بَكْرُ بْنُ مُحَمَّدٍ اَلْأَزْدِيُّ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ أَنَّهُ قَالَ: «إِنِّي أَكْرَهُ لِلْمَرْءِ أَنْ يُصَلِّيَ خَلْفَ اَلْإِمَامِ صَلاَةً لاَ يُجْهَرُ فِيهَا بِالْقِرَاءَةِ فَيَقُومَ كَأَنَّهُ حِمَارٌ» قَالَ قُلْتُ جُعِلْتُ فِدَاكَ فَيَصْنَعُ مَا ذَا قَالَ «يُسَبِّحُ.
Bakr ibn Muhammad Al-Azdi narrated by Imam Jafar ibn Muhammad Al-Sadiq عليه السلام that He said: "I dislike it for a person to pray behind the Imam in a prayer where the recitation is not audible, and he stands there like a donkey." I (Bakr) asked: "May I be your ransom, what should he do then?" Imam عليه السلام replied: "He should engage in tasbih (glorification)."
- Ṣaḥīḥ al-Faqīh, p. 56