Musnad Ahmad 30:3374

Yazid narrated to us, Muhammad ibn ‘Amr informed us, from Abu Salamah, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "For the fasting person there are two joys: a joy at the time of his breaking his fast, and a joy on the Day of Resurrection. And the odor of the mouth of the fasting person is more pleasant to Allah than the scent of musk."