Al-Kāfi - Volume 4 > The Excellence of Fast and Fasting
Hadith #16

16ـ عَلِيُّ بْنُ إِبْرَاهِيمَ عَنْ أَبِيهِ عَنِ السَّمَّانِ الأَرْمَنِيِّ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلاَم) قَالَ إِذَا رَأَى الصَّائِمُ قَوْماً يَأْكُلُونَ أَوْ رَجُلاً يَأْكُلُ سَجَّتْ كُلُّ شَعْرَةٍ مِنْهُ.

16. Ali ibn Ibrahim has narrated from his father from al-Samman al-Armaniy who has said the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, has said that when a fasting person observes people or a person eating food, every piece of his hair feels a kind of covering (tranquility).”