The Prayer of Fear, Pursuit, Encounter, and Competition
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 63
وَقَالَ عَلَيْهِ اَلسَّلاَمُ: «فَاتَ اَلنَّاسَ مَعَ عَلِيٍّ عَلَيْهِ اَلسَّلاَمُ يَوْمَ صِفِّينَ صَلاَةُ اَلظُّهْرِ وَ اَلْعَصْرِ وَ اَلْمَغْرِبِ وَ اَلْعِشَاءِ فَأَمَرَهُمْ فَكَبَّرُوا وَ هَلَّلُوا وَ سَبَّحُوا رِجَالاً وَ رُكْبَاناً.
Imam عليه السلام said: "The people missed the Dhuhr, Asr, Maghrib, and Isha prayers with Ali عليه السلام on the day of Siffin. He instructed them to make the takbir (saying 'Allahu Akbar'), tahleel (saying 'La ilaha illa Allah سبحانه وتعالى'), and tasbih (glorifying Allah سبحانه وتعالى) while standing and while mounted."
- Ṣaḥīḥ al-Faqīh