Reward for fasting is up to Allah for the servant restrains himself from his bodily desires

"Allah, may He be blessed and exalted, says: 'Fasting is for me and I shall reward for it. The fasting person has two moments of joy: When he breaks his fast and when he meets his Lord.' By the One in whose hand is my soul, the smell that comes from the mouth of the fasting person is better before Allah than the fragrance of musk." '  

عَنْ رَسُولِ اللَّهِ ﷺ قَالَ إِنَّ اللَّهَ تَبَارَكَ وَتَعَالَى يَقُولُ الصَّوْمُ لِي وَأَنَا أَجْزِي بِهِ وَلِلصَّائِمِ فَرْحَتَانِ حِينَ يُفْطِرُ وَحِينَ يَلْقَى رَبَّهُ وَالَّذِي نَفْسِي بِيَدِهِ لَخُلُوفُ فَمِ الصَّائِمِ أَطْيَبُ عِنْدَ اللَّهِ مِنْ رِيحِ الْمِسْكِ  

"The Messenger of Allah said: 'Allah, the Mighty and sublime, said: Every deed of the son of Adam is for him, except fasting; it is for me and I shall reward for it. Fasting is a shield. If any one of you is observing a fast, let him not utte obscene a fast, let him not utter obscene talk or raise his voice in anger, and if anyone insults him or wants to fight, let him say: I am a person who is fasting. By the One in Whose hand is the soul of Muhammad, the smell coming from the mouth of the fasting person is better before Allah than the fragrance of musk." ' (Sahih) This Hadith was narrated from Abu Hurairah by Saeed bin Al-Musayyab.  

قَالَ رَسُولُ اللَّهِ ﷺ قَالَ اللَّهُ ﷻ كُلُّ عَمَلِ ابْنِ آدَمَ لَهُ إِلاَّ الصِّيَامَ هُوَ لِي وَأَنَا أَجْزِي بِهِ الصِّيَامُ جُنَّةٌ فَإِذَا كَانَ يَوْمُ صَوْمِ أَحَدِكُمْ فَلاَ يَرْفُثْ وَلاَ يَصْخَبْ فَإِنْ شَاتَمَهُ أَحَدٌ أَوْ قَاتَلَهُ فَلْيَقُلْ إِنِّي امْرُؤٌ صَائِمٌ وَالَّذِي نَفْسُ مُحَمَّدٍ بِيَدِهِ لَخُلُوفُ فَمِ الصَّائِمِ أَطْيَبُ عِنْدَ اللَّهِ مِنْ رِيحِ الْمِسْكِ وَقَدْ رَوَى هَذَا الْحَدِيثَ عَنْ أَبِي هُرَيْرَةَ سَعِيدُ بْنُ الْمُسَيَّبِ  

"Fasting is a shield against the Fire. Whoever starts the day of fasting, let him not act in an ignorant manner during that day. If anyone treats him in an ignorant maner, let him not insult him or curse him, rather let him say: "I am fasting.' By the One in whole hand is the soul of Muhammad, the smell that comes from the mouth of a fasting person is better before Allah than the fragrance of musk."  

عَنِ النَّبِيِّ ﷺ قَالَ الصِّيَامُ جُنَّةٌ مِنَ النَّارِ فَمَنْ أَصْبَحَ صَائِمًا فَلاَ يَجْهَلْ يَوْمَئِذٍ وَإِنِ امْرُؤٌ جَهِلَ عَلَيْهِ فَلاَ يَشْتِمْهُ وَلاَ يَسُبَّهُ وَلْيَقُلْ إِنِّي صَائِمٌ وَالَّذِي نَفْسُ مُحَمَّدٍ بِيَدِهِ لَخُلُوفُ فَمِ الصَّائِمِ أَطْيَبُ عِنْدَ اللَّهِ مِنْ رِيحِ الْمِسْكِ  

Yahya related to me from Malik from Abu'z Zinad from al-Araj from Abu Hurayra that the Messenger of Allah ﷺ said, "By the One in Whose hand my self is, the smell of the breath of a man fasting is better with Allah than the scent of musk.' He leaves his desires and his food and drink for My sake. Fasting is for Me and I reward it. Every good action is rewarded by ten times its kind, up to seven hundred times, except fasting, which is for Me, and I reward it.' "  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ وَالَّذِي نَفْسِي بِيَدِهِ لَخُلُوفُ فَمِ الصَّائِمِ أَطْيَبُ عِنْدَ اللَّهِ مِنْ رِيحِ الْمِسْكِ إِنَّمَا يَذَرُ شَهْوَتَهُ وَطَعَامَهُ وَشَرَابَهُ مِنْ أَجْلِي فَالصِّيَامُ لِي وَأَنَا أَجْزِي بِهِ كُلُّ حَسَنَةٍ بِعَشْرِ أَمْثَالِهَا إِلَى سَبْعِمِائَةِ ضِعْفٍ إِلاَّ الصِّيَامَ فَهُوَ لِي وَأَنَا أَجْزِي بِهِ  

[Machine] The Messenger of Allah ﷺ said, "By the One in whose hand is my soul, the scent of the fasting person's mouth is more pleasant to Allah than the scent of musk. He says, 'The fasting person abstains from their desires, food, and drink for My sake. Fasting is for Me and I will reward it accordingly, with every good deed being multiplied ten times to seven hundred times, except for fasting, which is for Me and I will reward it.'"  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ وَالَّذِي نَفْسِي بِيَدِهِ لَخُلُوفُ فَمِ الصَّائِمِ أَطْيَبُ عِنْدَ اللهِ مِنْ رِيحِ الْمِسْكِ يَقُولُ ﷻ إِنَّمَا يَذَرُ شَهْوَتَهُ وَطَعَامَهُ وَشَرَابَهُ مِنْ أَجْلِي فَالصَّوْمُ لِي وَأَنَا أَجْزِي بِهِ كُلُّ حَسَنَةٍ بِعَشْرِ أَمْثَالِهَا إِلَى سَبْعِ مِائَةِ ضِعْفٍ إِلَّا الصِّيَامَ فَهُوَ لِي وَأَنَا أَجْزِي بِهِ  

[Machine] The Prophet ﷺ said, "A good deed is rewarded ten times its value, and fasting is for Me, and I reward it. The one who fasts leaves his desires and food and drink for My sake. Fasting is for Me, and I reward it. The smell from the mouth of the fasting person is better in the sight of Allah than the fragrance of musk."  

عَنِ النَّبِيِّ ﷺ قَالَ الْحَسَنَةُ بِعَشْرِ أَمْثَالِهَا وَالصَّوْمُ لِي وَأَنَا أَجْزِي بِهِ يَذَرُ طَعَامَهُ وَشَرَابَهُ بجَرَّايَ الصَّوْمُ لِي وَأَنَا أَجْزِي بِهِ وَلَخُلُوفُ فَمِ الصَّائِمِ عِنْدَ اللهِ أَطْيَبُ مِنْ رِيحِ الْمِسْكِ  

[Machine] From the Prophet ﷺ who said, "A good deed is worth ten like it and fasting is for Me and I will reward it. The person observing fasting leaves his desires and food and drink for My sake. Fasting is for Me and I will reward it. The odor in the mouth of a fasting person is better in the sight of Allah than the fragrance of musk."  

عَنِ النَّبِيِّ ﷺ قَالَ الْحَسَنَةُ بِعَشْرِ أَمْثَالِهَا وَالصَّوْمُ لِي وَأَنَا أَجْزِي بِهِ يَذَرُ طَعَامَهُ وَشَرَابَهُ بِجَرَّايَ قَالَ يَزِيدُ مِنْ أَجْلِي الصَّوْمُ لِي وَأَنَا أَجْزِي بِهِ وَلَخُلُوفُ فَمِ الصَّائِمِ عِنْدَ اللهِ أَطْيَبُ مِنْ رِيحِ الْمِسْكِ  

[Machine] The Messenger of Allah ﷺ said, "A good deed is multiplied by ten of its like, and fasting is for Me and I alone will reward it. A person leaves his food and drink for My sake, so fasting is for Me and I alone will reward it. The odor of the mouth of a fasting person is more pleasant to Allah than the scent of musk."  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ الْحَسَنَةُ بِعَشْرِ أَمْثَالِهَا وَالصَّوْمُ لِي وَأَنَا أَجْزِي بِهِ إِنَّهُ يَذَرُ طَعَامَهُ وَشَرَابَهُ مِنْ أَجْلِي فَالصَّوْمُ لِي وَأَنَا أَجْزِي بِهِ وَخُلُوفُ فَمِ الصَّائِمِ أَطْيَبُ عِنْدَ اللهِ مِنْ رِيحِ الْمِسْكِ  

[Machine] "Indeed, the Messenger of Allah ﷺ said: By the One in Whose hand is my soul, the smell from the mouth of a fasting person is more pleasant to Allah than the scent of musk. He leaves his food, drink, and desires for My sake. The fasting is for Me and I will reward it. Every good deed is rewarded ten times its like, up to seven hundred times, except for fasting, as it is for Me and I will reward it."  

إِنَّ رَسُولَ اللهِ ﷺ قَالَ وَالَّذِي نَفْسِي بِيَدِهِ لَخُلُوفُ فَمِ الصَّائِمِ أَطْيَبُ عِنْدَ اللهِ مِنْ رِيحِ الْمِسْكِ يَذَرُ طَعَامَهُ وَشَرَابَهُ وَشَهْوَتَهُ مِنْ أَجْلِي فَالصِّيَامُ لِي وَأَنَا أَجْزِي بِهِ كُلُّ حَسَنَةٍ بِعَشْرِ أَمْثَالِهَا إِلَى سَبْعِ مِائَةِ ضِعْفٍ إِلَّا الصِّيَامَ فَهُوَ لِي وَأَنَا أَجْزِي بِهِ  

[Machine] "Indeed, the Prophet ﷺ said that Allah Almighty narrates: 'Fasting is a shield by which My servant protects himself from the Fire, and fasting is for Me, and I will reward for it. The person fasting gives up their food and desires for My sake. By the One in whose hand is my soul, the smell emanating from the mouth of a fasting person is more pleasant to Allah on the Day of Resurrection than the fragrance of musk.'"  

أَنَّ النَّبِيَّ ﷺ قَالَ يَرْوِي عَنْ رَبِّهِ تَعَالَى «الصَّوْمُ جُنَّةٌ يُجَنُّ بِهَا عَبْدِي مِنَ النَّارِ وَالصَّوْمُ لِي وَأَنَا أَجْزِي بِهِ يَدَعُ طَعَامَهُ وَشَهْوَتَهُ مِنْ أَجْلِي وَالَّذِي نَفْسِي بِيَدِهِ لَخُلُوفُ فَمِ الصَّائِمِ عِنْدَ اللهِ ﷻ يَوْمَ الْقِيَامَةِ أَطْيَبُ مِنْ رِيحِ الْمِسْكِ»  

"Fasting is a shield against the Fire. Whoever starts the day of fasting, let him not act in an ignorant manner during that day. If anyone treats him in an ignorant maner, let him not insult him or curse him, rather let him say: "I am fasting.' By the One in whole hand is the soul of Muhammad, the smell that comes from the mouth of a fasting person is better before Allah than the fragrance of musk." (Using translation from Nasāʾī 2234)  

عَنِ النَّبِيِّ ﷺ قَالَ «الصِّيَامُ جُنَّةٌ مِنَ النَّارِ فَمَنْ أَصْبَحَ صَائِمًا فَلَا يَجْهَلْ يَوْمَئِذٍ وَإِنْ جَهِلَ عَلَيْهِ فَلَا يَشْتُمْهُ وَلَا يَسُبَّهُ وَلْيَقُلْ إِنِّي صَائِمٌ وَالَّذِي نَفْسُ مُحَمَّدٍ بِيَدِهِ لَخُلُوفُ فَمِ الصَّائِمِ أَطْيَبُ عِنْدِ اللهِ مِنْ رِيحِ الْمِسْكِ»  

[Machine] "Indeed, the Messenger of Allah ﷺ said, 'By the One in whose hand is my soul, the smell of the mouth of a fasting person is more beloved to Allah than the scent of musk. Allah says, 'The fasting person abandons their desires, food, and drink for My sake. Fasting is for Me and I will reward it accordingly. Every good deed is rewarded ten times its value, up to seven hundred times, except for fasting, for it is for Me and I will reward it.'"  

أَنَّ رَسُولَ اللهِ ﷺ قَالَ وَالَّذِي نَفْسِي بِيَدِهِ لَخُلُوفُ فَمِ الصَّائِمِ أَطْيَبُ عِنْدَ اللهِ مِنْ رِيحِ الْمِسْكِ يَقُولُ اللهُ ﷻ إِنَّمَا يَتْرُكُ شَهْوَتَهُ وَطَعَامَهُ وَشَرَابَهُ مِنْ أَجْلِي وَالصِّيَامُ لِي وَأَنَا أَجْزِي بِهِ كُلُّ حَسَنَةٍ بِعَشْرَةِ أَمْثَالِهَا إِلَى سَبْعِمِائَةِ ضِعْفٍ إِلَّا الصِّيَامَ فَهُوَ لِي وَأَنَا أَجْزِي بِهِ  

"الصِّيامُ جُنَّةٌ، وإِذَا كَانَ أَحدُكُم صَائِمًا فَلَا يَرْفُثْ ولا يجْهَلْ، وإِنِ امْرُؤٌ قَاتَلَهُ أَوْ شَاتَمَه فَلْيقُلْ إِنِّي صَائِمٌ مرَّتِين، والَّذى نَفْسِى بِيدِهِ لَخُلُوفُ فَم الصَّائِم أَطْيبُ عِنْد الله مِنْ رِيح الْمِسْكِ، يتْرُكُ طَعامهُ وَشَرَابَهُ وَشَهْوَتَهُ مِنْ أَجْلى، الصِّيَامُ لي وَأَنَا أَجْزِى بِهِ، وَالْحسَنَةُ بِعَشْر أَمْثَالِهَا".  

"الصِّيَامُ جُنَّةٌ مِنَ النَّارِ، فَمَنْ أَصْبَحَ صَائِمًا فَلَا يَجْهَل يَوْمئِذ، وَإِنِ امْرُؤٌ جَهِلَ عَلَيهِ فَلَا يَشْتُمْهُ وَلَا يَسُبَّهُ وَلْيَقُلْ إِنِّي صَائِمٌ، والَّذِى نَفسُ مُحَمَّد بيَدِهِ لَخُلُوفُ فَم الصَّائم أَطْيَبُ عِنْدَ الله مِنْ رِيح الْمِسْكِ ".  

"إِنَّ ربَّكم يقولُ: كلُّ حَسَنة بِعشْرِ أَمْثَالِهَا إِلى سبعِمائة ضعفٍ والصومُ لِى وأَنَا أَجْزِى به، والصومُ جُنَّةٌ من النَّارِ، وَلَخَلُوفُ فَمِ الصائِم أَطْيَبُ عندَ اللَّهِ من ريحِ المسكِ، وإِن جَهِلَ على أَحدِكم جاهلٌ، وهو صائمٌ فليقل: إِنِّى صائم".