"The month of Ramadan is in which the Qur'an was revealed as a guidance for mankind and clear proofs for the guidance and the criterion (between right and wrong), so every one who is present during that month should fast..." 2:185
Allah's Apostle said, "Allah said, 'All the deeds of Adam's sons (people) are for them, except fasting which is for Me, and I shall give the reward for it.' Fasting is a shield (from the fire and from committing sins). If one of you is fasting, he should avoid obscenity and quarreling, and if somebody should fight or quarrel with him, he should say, 'I am fasting.' By Him in Whose Hands my soul is' The unpleasant smell coming out from the mouth of a fasting person is better in the sight of Allah than the smell of musk. There are two pleasures for the fasting person, one at the time of breaking his fast, and the other at the time when he will meet his Lord; then he will be pleased because of his fasting."