Al-Kāfi
Hadith 84413- عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنْ حَمَّادِ بْنِ عِيسَى عَنْ إِبْرَاهِيمَ بْنِ عُمَرَ الْيَمَانِيِّ عَنْ أَبِي خَالِدٍ الْقَمَّاطِ أَنَّهُ سَمِعَ أَبَا عَبْدِ اللهِ (عَلَيْهِ السَّلام) يَقُولُ مَنْ كَانَ لَهُ مَا يُطْعِمُ فَلَيْسَ لَهُ أَنْ يَصُومَ يُطْعِمُ عَشَرَةَ مَسَاكِينَ مُدّاً مُدّاً فَمَنْ لَمْ يَجِدْ فَصِيَامُ ثَلاثَةِ أَيَّامٍ.
13. Ali ibn Ibrahim has narrated from his father from Hammad ibn ‘Isa from Ibrahim ibn ‘Umar af-Yemaniy from abu Khafid al-Qammat who has narrated the following: “I once heard abu ‘Abd Allah (a.s.), saying, ‘If one is able to feed ten destitute people for expiation of an oath he cannot fast instead. He must feed ten destitute people, one mud (a certain measurement) to each one, and if one cannot do this, then he must fast for three days.’”