Al-Kāfi - Volume 5 > The Case of Prices of Goods
Hadith #2

2- عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنْ يَعْقُوبَ بْنِ يَزِيدَ عَنْ مُحَمَّدِ بْنِ أَسْلَمَ عَمَّنْ ذَكَرَهُ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) قَالَ إِنَّ اللهَ جَلَّ وَعَزَّ وَكَّلَ بِالسِّعْرِ مَلَكاً فَلَنْ يَغْلُوَ مِنْ قِلَّةٍ وَلا يَرْخُصَ مِنْ كَثْرَةٍ.

2. A number of our people have narrated from Sahl ibn Ziyad from Ya’qub ibn Yazid from Muhammad ibn Aslam from those whom he has mentioned who has said the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, has said, ‘Allah, most Majestic, most Glorious, has assigned an angel on prices. Prices do not go high because of shortages and do not lower because of bounteousness.’”