Hadith #9

Abu Hurairah reported the Messenger of Allah saying: "Allah said: 'Every action of the son of Adam is for him except fasting, for that is solely for Me. I give the reward for it.' The fast is a shield. If one is fasting, he should not use foul language, raise his voice, or behave foolishly. If someone reviles him or fights with him he should say, 'I am fasting,' twice. By the One in whose hand is the soul of Muhammad, the [bad] breath of the one who is fasting is better in the sight of Allah on the Day of Resurrection than the smell of musk. The one who is fasting is happy at two times: when he breaks his fast he is happy with it, and when he meets his Lord he will be happy that he has fasted." Ahmad, Muslim, an-Nasa'i