Al-Kāfi

Hadith 688
trade
2- عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنْ حَمَّادِ بْنِ عِيسَى عَنْ حَرِيزٍ عَنْ مُحَمَّدِ بْنِ مُسْلِمٍ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) أَنَّهُ قَالَ فِي رَجُلٍ قَالَ لِرَجُلٍ بِعْ ثَوْبِي بِعَشَرَةِ دَرَاهِمَ فَمَا فَضَلَ فَهُوَ لَكَ فَقَالَ لَيْسَ بِهِ بَأْسٌ.
2. Ali ibn Ibrahim has narrated from his father from Hammad ibn ‘Isa from Hariz from Muhammad ibn Muslim who has said the following: “About the case of a man who says to another man, ‘Sell my cloth for ten dirham, if you sold for more, then the extra is for you.’ He (the Imam) said, ‘It is not harmful.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī