Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said, “Allah said, ‘Every deed of the son of Adam is for him, except for fasting. It is for Me and I will reward it.’ Fasting is a shield, so when one of you fasts, he may not be obscene or boisterous. If someone insults him or fights him, let him say: Indeed, I am fasting. By the One in whose hand is the soul of Muhammad, the breath coming from the mouth of a fasting person is more pleasant to Allah than the scent of musk. The fasting person has two moments of relief he enjoys: when he breaks his fast he is joyful, and when he meets his Lord he is joyful for his fasting.”
Source: Ṣaḥīḥ al-Bukhārī 1904, Ṣaḥīḥ Muslim 1151
Grade: Muttafaqun Alayhi (authenticity agreed upon) according to Al-Bukhari and Muslim
عَنْ أَبِي هُرَيْرَةَ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ اللَّهُ كُلُّ عَمَلِ ابْنِ آدَمَ لَهُ إِلاَّ الصِّيَامَ فَإِنَّهُ لِي وَأَنَا أَجْزِي بِهِ وَالصِّيَامُ جُنَّةٌ وَإِذَا كَانَ يَوْمُ صَوْمِ أَحَدِكُمْ فَلاَ يَرْفُثْ وَلاَ يَصْخَبْ فَإِنْ سَابَّهُ أَحَدٌ أَوْ قَاتَلَهُ فَلْيَقُلْ إِنِّي امْرُؤٌ صَائِمٌ وَالَّذِي نَفْسُ مُحَمَّدٍ بِيَدِهِ لَخُلُوفُ فَمِ الصَّائِمِ أَطْيَبُ عِنْدَ اللَّهِ مِنْ رِيحِ الْمِسْكِ لِلصَّائِمِ فَرْحَتَانِ يَفْرَحُهُمَا إِذَا أَفْطَرَ فَرِحَ وَإِذَا لَقِيَ رَبَّهُ فَرِحَ بِصَوْمِهِ
1904 صحيح البخاري كتاب الصوم باب هل يقول إني صائم إذا شتم
1151 صحيح مسلم كتاب الصيام باب فضل الصيام