عَنْ أَبِي هُرَيْرَةَ رضى اللّٰہ عنه أَنَّ رَسُولَ اللَّهِ صلّى اللّٰہ عليه وسلّم قَالَ: الصِّيَامُ جُنَّةٌ، فَلاَ يَرْفُثْ وَلاَ يَجْهَلْ، وَإِنِ امْرُؤٌ قَاتَلَهُ أَوْ شَاتَمَهُ فَلْيَقُلْ إِنِّي صَائِمٌ. مَرَّتَيْنِ، وَالَّذِي نَفْسِي بِيَدِهِ لَخُلُوفُ فَمِ الصَّائِمِ أَطْيَبُ عِنْدَ اللَّهِ تَعَالَى مِنْ رِيحِ الْمِسْكِ، يَتْرُكُ طَعَامَهُ وَشَرَابَهُ وَشَهْوَتَهُ مِنْ أَجْلِي، الصِّيَامُ لِي، وَأَنَا أَجْزِي بِهِ، وَالْحَسَنَةُ بِعَشْرِ أَمْثَالِهَا
Hazrat Abu Hurairahra narrated:
“Allah’s Messengersa said, ‘Fasting is a shield. So when one of you is fasting, let him not speak obscenely, nor behave ignorantly. If someone quarrels with him or abuses him, let him say, ‘I am fasting’, twice. By Him in whose hand is my soul, the smell from the mouth of one who is fasting is more pleasing to Allah the Exalted than the fragrance of musk. [Allah says,] ‘He has left his food, his drink and his desires for My sake. Fasting is for Me, and I am its reward.’ And a good deed is rewarded tenfold.’”
(Sahih al-Bukhari, Kitab as-sawm, Bab fadli s-sawm, Hadith 1894)