It was narrated from Abu Hurairah that the Messenger of Allah said:"(Allah says) fasting is for me and I shall reward for it. The fasting person rejoices twice: when he breaks his fast and the day when he meets his Lord. And the smell that come from the mouth of the fasting person is better before Allah than the fragrance of musk." '
أَخْبَرَنَا سُلَيْمَانُ بْنُ دَاوُدَ، عَنِ ابْنِ وَهْبٍ، قَالَ أَخْبَرَنِي عَمْرٌو، أَنَّ الْمُنْذِرَ بْنَ عُبَيْدٍ، حَدَّثَهُ عَنْ أَبِي صَالِحٍ السَّمَّانِ، عَنْ أَبِي هُرَيْرَةَ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ " الصِّيَامُ لِي وَأَنَا أَجْزِي بِهِ وَالصَّائِمُ يَفْرَحُ مَرَّتَيْنِ عِنْدَ فِطْرِهِ وَيَوْمَ يَلْقَى اللَّهَ وَخُلُوفُ فَمِ الصَّائِمِ أَطْيَبُ عِنْدَ اللَّهِ مِنْ رِيحِ الْمِسْكِ " .
Nesai
The Book of Fasting • Hadith 2214