عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ: ((كُلُّ عَمَلِ ابْنِ آدَمَ لَهُ إِلَّا الصِّيَامَ فَإِنَّهُ لِي وَأَنَا أَجْزِي بِهِ، وَالصِّيَامُ جُنَّةٌ وَإِذَا كَانَ يَوْمُ صَوْمِ أَحَدِكُمْ فَلَا يَرْفُثْ يَوْمَئِذٍ وَلَا يَصْخَبْ (وَفِي رِوَايَةٍ وَلَا يَجْهَلْ بَدَلَ وَلَا يَصْخَبْ) فَإِنْ شَاتَمَهُ أَحَدٌ، أَوْ قَاتَلَهُ فَلْيَقُلْ إِنِّي امْرُؤٌ صَائِمٌ مَرَّتَيْنِ وَالَّذِي نَفْسُ مُحَمَّدٍ بِيَدِهِ، لَخُلُوفُ فَمِ الصَّائِمِ أَطْيَبُ عِنْدَ اللَّهِ يَوْمَ الْقِيَامَةِ مِنْ رِيحِ الْمِسْكِ، وَلِلصَّائِمِ فَرْحَتَانِ يَفْرَحُهُمَا، إِذَا أَفْطَرَ فَرِحَ بِفِطْرِهِ وَإِذَا لَقِيَ رَبَّهُ عَزَّ وَجَلَّ فَرِحَ بِصِيَامِهِ))
It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: (Allah Almighty says:) Every deed of the son of Adam is for him, except for fasting; it is for Me, and I alone will reward it. Fasting is a shield (that protects from Hell). When any of you is fasting, he should neither use foul language, nor raise his voice, nor speak ignorantly. If someone abuses him or fights with him, he should say: I am fasting, I am fasting. By the One in Whose hand is my soul! The smell from the mouth of a fasting person is more beloved and purer to Allah on the Day of Resurrection than the fragrance of musk. For the fasting person there are two joys, with which he rejoices: when he breaks his fast, he is happy due to his breaking of the fast, and when he meets Allah Almighty, he will be happy due to his fasting.