The Sufficient (Vol 2) · Hadith 733 (#Ḥadīth #11)
Chapter 86 | Providing Food for a Believer
11ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنْ حَمَّادِ بْنِ عِيسَى عَنْ رِبْعِيٍّ قَالَ قَالَ أَبُو عَبْدِ الله (عَلَيهِ السَّلام) مَنْ أَطْعَمَ أَخَاهُ فِي الله كَانَ لَهُ مِنَ الأجْرِ مِثْلُ مَنْ أَطْعَمَ فِئَاماً مِنَ النَّاسِ قُلْتُ وَمَا الْفِئَامُ مِنَ النَّاسِ قَالَ مِائَةُ أَلْفٍ مِنَ النَّاسِ.
11. Ali ibn Ibrahim has narrated from his father from Hammad ibn ‘Isa from Rib’i who has said the following: “Once Abu ‘Abdillah said, ‘Whoever feeds his Muslim brother (in belief) for the sake of Allah his reward will be like the reward of a person who feeds a Fi’Am, (whole group) of people.’ 1 then asked, ‘How many is a Fi’am of people?’ The Imam said, ‘It is one hundred thousand people.’”
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).