Chapter on Hoarding and Pricing
Man Lā Yaḥḍuruh al-Faqīh|Volume 3|Book 2|Chapter 18
وَ رَوَى اَلنَّضْرُ عَنْ عَبْدِ اَللَّهِ بْنِ سِنَانٍ عَنْ أَبِي عَبْدِ اَللَّهِ عَلَيْهِ اَلسَّلاَمُ أَنَّهُ قَالَ: فِي تُجَّارٍ قَدِمُوا أَرْضاً وَ اِشْتَرَكُوا عَلَى أَنْ لاَ يَبِيعُوا بَيْعَهُمْ إِلاَّ بِمَا أَحَبُّوا قَالَ "لاَ بَأْسَ بِذَلِكَ".
Al-Nadr narrated from Abdullah ibn Sinan that Abu Abdullah عليه السلام, said regarding merchants who arrived at a land and agreed among themselves not to sell their goods except at a price they desired: "There is no harm in that."
- Ṣaḥīḥ al-Faqīh, p. 243