Narrated Abu Huraira: Allah’s Messenger ) said, Fasting is a shield (or a screen or a shelter). So, the person observing fasting should avoid sexual relation with his wife and should not behave foolishly and impudently, and if somebody fights with him or abuses him he should tell him twice, “I am fasting.” The Hands my soul is, the smell coming out from the mouth of a fasting person is better in the sight of Allah than the smell of musk. (Allah says about the fasting person), He has left his food, drink and desires for My sake. The fast is for Me. So I will reward (the fasting person) for it and the reward is good deeds multiplied ten times.
( Sahih al-Bukhari )