Fasting is one of the important pillars of Islam and the month of Ramadan is the month during which fasting has been made obligatory for all adults and sane Muslims.
“O ye who believe! Fasting is prescribed to you as it was prescribed to those before you, that ye may (learn) self-restraint, (Fasting) for a fixed number of days;
but if any of you is ill, or on a journey, the prescribed number (Should be made up) from days later. For those who can do it (With hardship), is a ransom, the feeding of one that is indigent. But he that will give more, of his own free will, it is better for him.
And it is better for you that ye fast, if ye only knew.”
By fasting during Ramadan, Momins meet one of the obligations required of them by Allah (swt) and henceforth become entitled to great reward in the Hereafter, insh’Allah. Any lapse in Islamic obligations amounts to sin. Fasting is a form of worship and Allah alone rewards that person for it on the Day of Judgment.