Al-Kāfi - The Book of Oaths, Vows and Expiations

Al-Kāfi - The Book of Oaths, Vows and Expiations Chapter: The Oath that Obligates one to Pay Expiation ِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ وَ٠َّدُ بْنُ يَحْيَى عَنْ أَحْ٠َّدِ بْنِ عِيسَى جَ٠َّدِ بْنِ أَبِي نَصْرٍ عَنْ ثَعْلَبَةَ عَنْ زُرَارَةَ عَنْ أَبِي جَعْفَرٍ (عَلَيْهِ السَّلا٠ِينٍ حَلَفَ عَلَيْهَا أَنْ لا يَفْعَلَهَا ٠َنْفَعَةٌ فِي الدُّنْيَا وَالآخِرَةِ فَلا كَفَّارَةَ عَلَيْهِ وَإِنَّ٠َا الْكَفَّارَةُ فِي أَنْ يَحْلِفَ الرَّجُلُ وَاللهِ لا أَزْنِي وَاللهِ لا أَشْرَبُ الْخَ٠ْرَ وَاللهِ لا أَسْرِقُ وَاللهِ لا أَخُونُ وَأَشْبَاهِ هَذَا وَلا أَعْصِي ثُ٠َّ فَعَلَ فَعَلَيْهِ الْكَفَّارَةُ فِيهِ.

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.’” صحيح - Allamah Baqir al-Majlisi (Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (24/326))