٤ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ أَحْمَدَ بْنِ مُحَمَّدٍ عَنْ عَلِيِّ بْنِ الْحَكَمِ عَنْ مُوسَى بْنِ بَكْرٍ قَالَ لِكُلِّ شَيْ‏ءٍ زَكَاةٌ وَزَكَاةُ الأَجْسَادِ الصَّوْمُ.
4. Muhammad ibn Yahya has narrated from Ahmad ibn Muhammad from Ali ibn al-Hakam from Musa ibn Bakr who has said the following: “He (the Imam) , said, ‘Everything has a cleanser; the cleanser for bodies is fasting.” 