وَ كَتَبَ مُحَمَّدُ بْنُ اَلْحَسَنِ اَلصَّفَّارُ رَضِيَ اَللَّهُ عَنْهُ إِلَى أَبِي مُحَمَّدٍ اَلْحَسَنِ بْنِ عَلِيٍّ عَلَيْهِ اَلسَّلاَمُ: رَجُلٌ حَلَفَ بِالْبَرَاءَةِ مِنَ اَللَّهِ عَزَّ وَ جَلَّ أَوْ مِنْ رَسُولِ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ فَحَنِثَ مَا تَوْبَتُهُ وَ مَا كَفَّارَتُهُ فَوَقَّعَ عَلَيْهِ اَلسَّلاَمُ "يُطْعِمُ عَشَرَةَ مَسَاكِينَ لِكُلِّ مِسْكِينٍ مُدٌّ وَ يَسْتَغْفِرُ اَللَّهَ عَزَّ وَ جَلَّ".
Muhammad ibn al-Hasan al-Saffar, may Allah (swt) be pleased with him, wrote to Abu Muhammad al-Hasan ibn Ali (a.s) asking about a man who swore an oath of disassociation from Allah (swt), the Almighty and Glorious, or from the Messenger of Allah (swt) (peace be upon him and his family) and then broke his oath. What is his repentance and expiation? Imam (a.s) responded: "He should feed ten needy people, giving each needy person one mudd of food, and seek forgiveness from Allah (swt), the Almighty and Glorious."