Al-Kāfi - Volume 5 > The Case of one Who Contracts for a Work for a Certain Amount and then Contracts with another Person for More
Hadith #2

2- أَبُو عَلِيٍّ الأشْعَرِيُّ عَنْ مُحَمَّدِ بْنِ عَبْدِ الْجَبَّارِ عَنْ صَفْوَانَ عَنِ الْحَكَمِ الْخَيَّاطِ قَالَ قُلْتُ لأبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) إِنِّي أَتَقَبَّلُ الثَّوْبَ بِدِرْهَمٍ وَأُسَلِّمُهُ بِأَكْثَرَ مِنْ ذَلِكَ لا أَزِيدُ عَلَى أَنْ أَشُقَّهُ قَالَ لا بَأْسَ بِهِ ثُمَّ قَالَ لا بَأْسَ فِيمَا تَقَبَّلْتَهُ مِنْ عَمَلٍ ثُمَّ اسْتَفْضَلْتَ فِيهِ.

2. Abu Ali al-Ash’ariy has narrated from Muhammad ibn ‘Abd al-Jabbar from Safwan from al-Hakam al-Khayyat who has said the following: “Upon my asking abu ‘Abd Allah, ‘Alayhi al-Salam, about the case of a cloth (for tailoring) that I accept for a dirham and then give it to another person on credit for more than a dirham without doing anything more than cutting. He (the Imam) said, ‘It is not unlawful.’ He (the Imam) then said, ‘It is not unlawful if you accept a work then seek increase in it.’”