٣- مُحَمَّدُ بْنُ يَحْيَى وَغَيْرُهُ عَنْ مُحَمَّدِ بْنِ أَحْمَدَ عَنْ مُحَمَّدِ بْنِ عِيسَى عَنْ مُحَمَّدِ بْنِ الْفُضَيْلِ قَالَ قُلْتُ لِلرِّضَا (عَلَيْهِ السَّلام) رَجُلٌ اشْتَرَى دَيْناً عَلَى رَجُلٍ ثُمَّ ذَهَبَ إِلَى صَاحِبِ الدَّيْنِ فَقَالَ لَهُ ادْفَعْ إِلَيَّ مَا لِفُلانٍ عَلَيْكَ فَقَدِ اشْتَرَيْتُهُ مِنْهُ قَالَ يَدْفَعُ إِلَيْهِ قِيمَةَ مَا دَفَعَ إِلَى صَاحِبِ الدَّيْنِ وَبَرِئَ الَّذِي عَلَيْهِ الْمَالُ مِنْ جَمِيعِ مَا بَقِيَ عَلَيْهِ. 
3. Muhammad ibn Yahya and others have narrated from Muhammad ibn Ahmad from Muhammad ibn ‘Isa from Muhammad ibn al- Fudayl who has said the following: “I once asked al-Rida’ , about the case of a man who buys a loan to collect it from the debtor and demands the debtor for payment. He (the Imam) said, The debtor pays what the collector has paid to the creditor and in so doing becomes free of the responsibility of paying all that was due on him.’” 