Al-Kāfi - Volume 5 > The Case of Prices of Goods
Hadith #6

6- مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ مُحَمَّدِ بْنِ إِسْمَاعِيلَ عَنْ أَبِي إِسْمَاعِيلَ السَّرَّاجِ عَنْ حَفْصِ بْنِ عُمَرَ عَنْ رَجُلٍ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) قَالَ غَلاءُ السِّعْرِ يُسِي‏ءُ الْخُلُقَ وَيُذْهِبُ الأمَانَةَ وَيُضْجِرُ الْمَرْءَ الْمُسْلِمَ.

6. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Muhammad ibn ‘Isma’il al-Sarraj from Hafs ibn ‘Umar from a man who has said the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, has said, ‘High prices worsens moral discipline, destroy trust and cause suffering to the Muslims.’”