٨- مُحَمَّدُ بْنُ يَحْيَى قَالَ كَتَبَ مُحَمَّدُ بْنُ الْحَسَنِ إِلَى أَبِي مُحَمَّدٍ (عَلَيْهِ السَّلام) رَجُلٌ اشْتَرَى مِنْ رَجُلٍ ضَيْعَةً أَوْ خَادِماً بِمَالٍ أَخَذَهُ مِنْ قَطْعِ الطَّرِيقِ أَوْ مِنْ سَرِقَةٍ هَلْ يَحِلُّ لَهُ مَا يَدْخُلُ عَلَيْهِ مِنْ ثَمَرَةِ هَذِهِ الضَّيْعَةِ أَوْ يَحِلُّ لَهُ أَنْ يَطَأَ هَذَا الْفَرْجَ الَّذِي اشْتَرَاهُ مِنَ السَّرِقَةِ أَوْ مِنْ قَطْعِ الطَّرِيقِ فَوَقَّعَ (عَلَيْهِ السَّلام) لا خَيْرَ فِي شَيْ‏ءٍ أَصْلُهُ حَرَامٌ وَلا يَحِلُّ اسْتِعْمَالُهُ.
8. Muhammad ibn Yahya has said the following: “Once Muhammad ibn al-Hassan wrote to abu Muhammad , and asked about the case of a man who buys goods or a slave-girl in exchange for a certain amount of assets from one who plunders people on the road or from a thief; if it is lawful for him to use the benefits, or fruits thereof or marry the slave-girl which he has bought from a thief or road plunderer. He (the Imam) signed the answer that said, ’Nothing is good in whatever originates from an unlawful source; and using such matters is not lawful.’” 