Al-Kāfi

Hadith 840
expiationoaths-vowsfood-drink
9- عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ ابْنِ أَبِي عُمَيْرٍ عَنْ هِشَامِ بْنِ الْحَكَمِ عَنْ أَبِي عَبْدِ اللهِ (عَلَيْهِ السَّلام) فِي كَفَّارَةِ الْيَمِينِ مُدٌّ مُدٌّ مِنْ حِنْطَةٍ وَحَفْنَةٌ لِتَكُونَ الْحَفْنَةُ فِي طَحْنِهِ وَحَطَبِهِ.
9. Ali ibn Ibrahim has narrated from his father from Ibn Abi ‘Umayr from Hisham ibn al-Hakam who has narrated the following: “About the Kaffarah (expiation) due to an oath which is one mud (a certain measurement) for each person abu ‘Abd Allah (a.s.), has said that it must be a handful of food made into flour and cooked.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī