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

ذِكْرُ الْإِخْبَارِ عَنْ إِعْطَاءِ اللَّهِ جَلَّ وَعَلَا ثَوَابَ الصَّائِمِينَ فِي الْقِيَامَةِ بِغَيْرِ حِسَابٍ

ibnhibban:3416 – al-Faḍl b. al-Ḥubāb > al-Qaʿnabī > ʿAbd al-ʿAzīz b. Muḥammad > al-ʿAlāʾ from his father > Abū Hurayrah

[Machine] Narrated Abu Huraira: The Messenger of Allah ﷺ said: "Allah, the Most Blessed and Exalted, said: 'Every good deed of the son of Adam will be multiplied; a good deed is multiplied by ten to seven hundred times, except for fasting, for it is for Me and I will reward for it. The fasting person abstains from food, drink, and sexual relations, so My reward is for him. He leaves his desires and food for My sake.' The person observing fasting should avoid obscene speech and ignorance. If someone abuses him or quarrels with him, he should say: 'I am fasting, I am fasting.'"  

ابن حبّان:٣٤١٦ – أَخْبَرَنَا الْفَضْلُ بْنُ الْحُبَابِ قَالَ

حَدَّثَنَا الْقَعْنَبِيُّ قَالَ حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ مُحَمَّدٍ عَنِ الْعَلَاءِ عَنْ أَبِيهِ عَنْ أَبِي هُرَيْرَةَ قَالَ قَالَ رَسُولُ اللَّهِ ﷺ «قَالَ اللَّهُ تَبَارَكَ وَتَعَالَى كُلُّ حَسَنَةٍ عَمِلَهَا ابْنُ آدَمَ جَزَيْتُهُ بِهَا عَشْرَ حَسَنَاتٍ إِلَى سَبْعِ مِائَةِ ضِعْفٍ إِلَّا الصِّيَامَ فَهُوَ لِي وَأَنَا أَجْزِي بِهِ الصِّيَامُ جُنَّةٌ فَمَنْ كَانَ صَائِمًا فَلَا يَرْفُثْ وَلَا يَجْهَلْ فَإِنِ امْرُؤٌ شَتَمُهُ أَوْ آذَاهُ فَلْيَقُلْ إِنِّي صَائِمٌ إِنِّي صَائِمٌ»  

See similar narrations below:

Collected by Aḥmad
ahmad:9363 – ʿAffān > ʿAbd al-Wārith > ʿAlī b. Zayd > Saʿīd b. al-Musayyib > Abū Hurayrah

[Machine] The Prophet ﷺ said, "Indeed, your Lord says, 'O son of Adam, with each good deed you do, I will multiply it tenfold up to seven hundred times, and fasting is for Me and I will reward for it. Fasting is a shield from the Hellfire, and the odor from the mouth of a fasting person is more pleasant to Allah than the scent of musk. If someone insults or harms you while you are fasting, say, 'I am fasting.''"  

أحمد:٩٣٦٣ – حَدَّثَنَا عَفَّانُ حَدَّثَنَا عَبْدُ الْوَارِثِ أَخْبَرَنَا عَلِيُّ بْنُ زَيْدٍ عَنْ سَعِيدِ بْنِ الْمُسَيِّبِ عَنْ أَبِي هُرَيْرَةَ

عَنِ النَّبِيِّ ﷺ قَالَ إِنَّ رَبَّكُمْ ﷻ يَقُولُ يَا ابْنَ آدَمَ بِكُلِّ حَسَنَةٍ عَشْرُ حَسَنَاتٍ إِلَى سَبْعِ مِائَةِ ضِعْفٍ إِلَى أَضْعَافٍ كَثِيرَةٍ وَالصَّوْمُ لِي وَأَنَا أَجْزِي بِهِ وَالصَّوْمُ جُنَّةٌ مِنَ النَّارِ وَلَخُلُوفُ فَمِ الصَّائِمِ أَطْيَبُ عِنْدَ اللهِ ﷻ مِنْ رِيحِ الْمِسْكِ وَإِنْ جَهِلَ عَلَى أَحَدِكُمْ جَاهِلٌ وَهُوَ صَائِمٌ فَلْيَقُلْ إِنِّي صَائِمٌ