١٨- مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنِ ابْنِ مَحْبُوبٍ عَنْ سَعْدِ بْنِ أَبِي خَلَفٍ قَالَ قُلْتُ لأبِي الْحَسَنِ مُوسَى (عَلَيْهِ السَّلام) إِنِّي كُنْتُ اشْتَرَيْتُ جَارِيَةً سِرّاً مِنِ امْرَأَتِي وَإِنَّهُ بَلَغَهَا ذَلِكَ فَخَرَجَتْ مِنْ مَنْزِلِي وَأَبَتْ أَنْ تَرْجِعَ إِلَى مَنْزِلِي فَأَتَيْتُهَا فِي مَنْزِلِ أَهْلِهَا فَقُلْتُ لَهَا إِنَّ الَّذِي بَلَغَكِ بَاطِلٌ وَإِنَّ الَّذِي أَتَاكِ بِهَذَا عَدُوٌّ لَكِ أَرَادَ أَنْ يَسْتَفِزَّكِ فَقَالَتْ لا وَاللهِ لا يَكُونُ بَيْنِي وَبَيْنَكَ خَيْرٌ أَبَداً حَتَّى تَحْلِفَ لِي بِعِتْقِ كُلِّ جَارِيَةٍ لَكَ وَبِصَدَقَةِ مَالِكَ إِنْ كُنْتَ اشْتَرَيْتَ جَارِيَةً وَهِيَ فِي مِلْكِكَ الْيَوْمَ فَحَلَفْتُ لَهَا بِذَلِكَ وَأَعَادَتِ الْيَمِينَ وَقَالَتْ لِي فَقُلْ كُلُّ جَارِيَةٍ لِيَ السَّاعَةَ فَهِيَ حُرَّةٌ فَقُلْتُ لَهَا كُلُّ جَارِيَةٍ لِيَ السَّاعَةَ فَهِيَ حُرَّةٌ وَقَدِ اعْتَزَلْتُ جَارِيَتِي وَهَمَمْتُ أَنْ أُعْتِقَهَا وَأَتَزَوَّجَهَا لِهَوَايَ فِيهَا فَقَالَ لَيْسَ عَلَيْكَ فِيمَا أَحْلَفَتْكَ عَلَيْهِ شَيْ‏ءٌ وَاعْلَمْ أَنَّهُ لا يَجُوزُ عِتْقٌ وَلا صَدَقَةٌ إِلا مَا أُرِيدَ بِهِ وَجْهُ اللهِ وَثَوَابُهُ. 
18. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from ibn Mahbub from Sa‘d ibn abu Khalaf who has narrated the following: “I once said to abu al-Hassan, Musa , that I had bought a slave-girl secretly because of my wife and when she found out she went out of my home and refused to come back. I met her in the house of her people and said that what she has heard is false and the person who has told her is her enemy who wants to remove her from home. She said, ‘No, by Allah there will never be anything good between me and you until you swear to free all slave-girls that belong to you and give all of your assets in charity if you have bought something. You must free a slave-girl that still belongs to you.’ I took an oath as she asked and she made me repeat the oath and say, ‘Every slave-girl that belongs to me at this hour is free,’ and I said just as she had asked. I have separated my slave-girl. I thought to free and then marry her because I love her.’ He (the Imam) said, ‘You do not owe anything because of your oath and you must take notice that to free a slave or charity is not valid unless it is for the sake of Allah and for the reward from Him.’” 