Al-Kāfi
Hadith 8118- عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ وَمُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ عِيسَى جَمِيعاً عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ أَبِي نَصْرٍ عَنْ ثَعْلَبَةَ عَنْ زُرَارَةَ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ السَّلام) قَالَ كُلُّ يَمِينٍ حَلَفَ عَلَيْهَا أَنْ لا يَفْعَلَهَا مِمَّا لَهُ فِيهِ مَنْفَعَةٌ فِي الدُّنْيَا وَالآخِرَةِ فَلا كَفَّارَةَ عَلَيْهِ وَإِنَّمَا الْكَفَّارَةُ فِي أَنْ يَحْلِفَ الرَّجُلُ وَاللهِ لا أَزْنِي وَاللهِ لا أَشْرَبُ الْخَمْرَ وَاللهِ لا أَسْرِقُ وَاللهِ لا أَخُونُ وَأَشْبَاهِ هَذَا وَلا أَعْصِي ثُمَّ فَعَلَ فَعَلَيْهِ الْكَفَّارَةُ فِيهِ.
8. A number of our people have narrated from Sahl ibn Ziyad and Ahmad ibn Muhammad ibn ‘Isa all from Ahmad ibn Muhammad from ibn abu Nasr from Tha’labah from Zurarah who has narrated the following: “Abu Ja‘far (a.s.), has said, ‘Every act for which one takes an oath not to do it and the act is beneficial in this and in the hereafter, there is no expiation for it. Kaffarah (expiation) becomes obligatory when one takes an oath and says, ‘By Allah I will not commit fornication, by Allah I will not drink wine, by Allah I will not steal, by Allah I will not act treacherously and so on and I will not disobey, but he does, then Kaffarah (expiation) becomes obligatory.’”