٤ـ عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنْ مَنْصُورِ بْنِ الْعَبَّاسِ عَنْ إِبْرَاهِيمَ الأَحْوَلِ عَنْ عِمْرَانَ الزَّعْفَرَانِيِّ قَالَ قُلْتُ لأَبِي عَبْدِ الله (عَلَيْهِ السَّلاَم) إِنَّا نَمْكُثُ فِي الشِّتَاءِ الْيَوْمَ وَالْيَوْمَيْنِ لا تُرَى شَمْسٌ وَلا نَجْمٌ فَأَيَّ يَوْمٍ نَصُومُ قَالَ انْظُرِ الْيَوْمَ الَّذِي صُمْتَ مِنَ السَّنَةِ الْمَاضِيَةِ وَعُدَّ خَمْسَةَ أَيَّامٍ وَصُمِ الْيَوْمَ الْخَامِسَ. 
4. A number of our people have narrated from Sahl ibn Ziyad from Mansur ibn al-‘Abbas from Ibrahim al-Ahwal from ’Imran al- Za‘faraniy who has said the following: “I once said to abu ‘Abd Allah , ‘In winter we cannot see the sun or stars for one or two days. When must we fast?’ He (the Imam) said, ‘Think, on what day you fasted last year, then count five days and fast on the fifth day.’” 