It was narrated from Abu Hurairah that the Messenger of Allah (ﷺ) 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." '
Source: sunnah.com
Other translations
Arabic
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 " .
sunnah.com