Al-Kāfi - The Book of Commerce

Al-Kāfi - The Book of Commerce Chapter: The Case of one Who Contracts for a Work for a Certain Amount and then Contracts with another Person for More َّدُ بْنُ يَحْيَى عَنْ ٠َّدِ بْنِ الْحُسَيْنِ عَنْ صَفْوَانَ عَنِ الْعَلاءِ عَنْ ٠) أَنَّهُ سُئِلَ عَنِ الرَّجُلِ يَتَقَبَّلُ بِالْعَ٠َلُ فِيهِ وَيَدْفَعُهُ إِلَى آخَرَ فَيَرْبَحُ فِيهِ قَالَ لا إِلا أَنْ يَكُونَ قَدْ عَ٠ِلَ فِيهِ شَيْئاً.

He (the Imam) said, ‘No, he cannot do so unless he does certain work in it.’” صحيح - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (9/358))