Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
ahmad-zuhd:1743 – ʿAbdullāh b. Mandal > Fuḍayl b. ʿIyāḍ > Hishām b. Ḥafṣah > Abū al-ʿĀliyah

[Machine] "The fasting person is in worship as long as he does not backbite, even if he is sleeping on his bed."  

الزهد لأحمد:١٧٤٣ – حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَنْدَلٍ أَنْبَأَنَا فُضَيْلُ بْنُ عِيَاضٍ عَنْ هِشَامِ بْنِ حَفْصَةَ عَنْ أَبِي الْعَالِيَةِ قَالَ

«الصَّائِمُ فِي عِبَادَةٍ مَا لَمْ يَغْتَبْ وَإِنْ كَانَ نَائِمًا عَلَى فِرَاشِهِ»  

See similar narrations below:

Collected by Suyūṭī