Chapter on the Reasons Behind Hajj
Man Lā Yaḥḍuruh al-Faqīh|Volume 2|Book 3|Chapter 1
وَ إِنَّمَا صَارَ اَلتَّكْبِيرُ بِمِنًى فِي دُبُرِ خَمْسَ عَشْرَةَ صَلاَةً وَ بِالْأَمْصَارِ فِي دُبُرِ عَشَرَةِ صَلَوَاتُ لِأَنَّهُ إِذَا نَفَرَ اَلنَّاسُ فِي اَلنَّفْرِ اَلْأَوَّلِ أَمْسَكَ أَهْلُ اَلْأَمْصَارِ عَنِ اَلتَّكْبِيرِ وَ كَبَّرَ أَهْلُ مِنًى مَا دَامُوا بِمِنًى إِلَى اَلنَّفْرِ اَلْأَخِيرِ.
The Takbir in Mina after fifteen prayers and in the towns after ten prayers was instituted because when people depart during the first departure (on the 12th of Dhul-Hijjah), the people of the towns cease the Takbir, while the people of Mina continue to say Takbir as long as they remain in Mina until the final departure (on the 13th of Dhul-Hijjah).
- Ṣaḥīḥ al-Faqīh