Al-Kāfi
Hadith 5235- عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ ابْنِ فَضَّالٍ عَنْ ظَرِيفِ بْنِ نَاصِحٍ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) قَالَ لا تُخَالِطُوا وَلا تُعَامِلُوا إِلا مَنْ نَشَأَ فِي الْخَيْرِ.
5. A number of our people have narrated from Ahmad ibn Muhammad from ibn Faddal from Zarif ibn Nasih who has said the following: “Abu ‘Abd Allah (a.s.), has said, ‘You must not form contracts with anyone other than those who are established in goodness.”