Congregational Prayer and Its Virtue
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 57
وَقَالَ عَلَيْهِ اَلسَّلاَمُ: «إِنْ سَرَّكُمْ أَنْ تُزَكُّوا صَلاَتَكُمْ فَقَدِّمُوا خِيَارَكُمْ.
Imam عليه السلام said: "If it pleases you to purify and perfect your prayers, then choose the best among you (to lead)."
- Ṣaḥīḥ al-Faqīh