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:10025 – ʿAbd al-Raḥman b. Mahdī > Ḥammād b. Salamah > Muḥammad b. Ziyād > Abū Hurayrah > Abū al-Qāsim ﷺ

[Machine] All acts of worship are atonement except fasting and fasting is for Me, and I reward it.  

أحمد:١٠٠٢٥ – حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ عَنْ حَمَّادِ بْنِ سَلَمَةَ عَنْ مُحَمَّدِ بْنِ زِيَادٍ قَالَ سَمِعْتُ أَبَا هُرَيْرَةَ يَقُولُ سَمِعْتُ أَبَا الْقَاسِمِ ﷺ يَقُولُ قَالَ

اللهُ ﷻ كُلُّ الْعَمَلِ كَفَّارَةٌ إِلَّا الصَّوْمَ وَالصَّوْمُ لِي وَأَنَا أَجْزِي بِهِ  

See similar narrations below:

Collected by Ṭabarānī
tabarani:18435 – al-Walīd b. Ḥammād > Sulaymān b. ʿAbd al-Raḥman > Bishr b. ʿAwn > Bakkār b. Tamīm > Makḥūl > Wāthilah

[Machine] The Messenger of Allah, ﷺ , said: "Fasting is a shield and it is a fortress among the fortresses of the believer. And every action of a person is for himself, except for fasting, for it is for Me and I will reward it."  

الطبراني:١٨٤٣٥ – حَدَّثَنَا الْوَلِيدُ بْنُ حَمَّادٍ ثنا سُلَيْمَانُ بْنُ عَبْدِ الرَّحْمَنِ ثنا بِشْرُ بْنُ عَوْنٍ ثنا بَكَّارُ بْنُ تَمِيمٍ عَنْ مَكْحُولٍ عَنْ وَاثِلَةَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ الصِّيَامُ جُنَّةٌ وَهُوَ حِصْنٌ مِنْ حُصُونِ الْمُؤْمِنِ وَكُلُّ عَمِلٍ لِصَاحِبِهِ إِلَّا الصِّيَامَ يَقُولُ اللهُ ﷻ الصَّوْمُ لِي وَأَنَا أَجْزِي بِهِ