Musnad Abu Ya'la al-Mawsili 42:32

Abu Bakr narrated to us, Ibn Fudayl narrated to us, from Abu Sinan, from Abu Salih, from Abu Sa’id and Abu Hurayrah, who both said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, Allah says: 'Fasting is for Me, and I shall reward for it.' And for the fasting person there are two joys: when he breaks his fast, he rejoices, and when he meets Allah, he rejoices. And by the One in Whose hand is the soul of Muhammad, the odor of the mouth of the fasting person is more pleasant to Allah than the scent of musk."