The Prophet ﷺ said, "(Allah said), 'Every good deed of Adam's son is for him except fasting; it is for Me. and I shall reward (the fasting person) for it.' Verily, the smell of the mouth of a fasting person is better to Allah than the smell of musk." (Using translation from Bukhārī 5927)   

قَالَ رَسُولُ اللهِ ﷺ قَالَ اللهُ كُلُّ عَمَلِ ابْنِ آدَمَ لَهُ إِلَّا الصِّيَامُ الصِّيَامُ لِي وَأَنَا أَجْزِي بِهِ وَلَخُلُوفُ فَمِ الصَّائِمِ أَطْيَبُ عِنْدَ اللهِ مِنْ رِيحِ الْمِسْكِ  

[Machine] The Messenger of Allah ﷺ said, "By Him in whose hand is the soul of Muhammad, the breath of the fasting person is more pleasing to Allah than the scent of musk."  

قَالَ رَسُولُ اللهِ ﷺ «وَالَّذِي نَفْسُ مُحَمَّدٍ بِيَدِهِ لَخُلُوفُ فَمِ الصَّائِمِ أَطْيَبُ عِنْدَ اللهِ مِنْ رِيحِ الْمِسْكِ»