Saum Fasting is the third pillar of Islam,
The Prophet sall Allaahu ‘alayhi wasallam said, “(Allah said), ‘every good deed of the son of Adam is for him except fasting; it is for Me. and I shall reward (the fasting person) for it.’ Verily, the smell of the mouth of a fasting person is better to Allah than the smell of musk.” [Bukhari]
