Abu Hurairah reported, The Messenger of Allah p.b.u.h. said:
“Fasting is an armour with which one protects oneself; so let not him (who fasts) utter immodest (or foul) speech, nor let him act in an ignorant manner; and if a man quarrels with him or abuses him, he should say twice, I am fasting. And by Him, in Whose hand is my soul, the odour of the mouth of one fasting is sweeter in the estimation of Allah than the odour of musk - he gives up his food and his drink and his (sexual) desire for My sake; fasting is for Me and I will grant its reward; and a virtue brings reward ten times like it”.