Al-Kāfi - Volume 4 > The Excellence of Fast and Fasting
Hadith #12

12ـ وَبِهَذَا الإِسْنَادِ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ السَّلاَم) قَالَ نَوْمُ الصَّائِمِ عِبَادَةٌ وَنَفَسُهُ تَسْبِيحٌ.

12. It is narrated, through the same chain (narrators of previous Hadith), who has said the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, has said that a fasting person’s sleeping is also counted as worshipping and his breathing as speaking of the glory of Allah.”