The Rules of Fasting The Obligation of Fasting Issue 546: In every year it is obligatory for each adult to fast one month of blessed Ramadhaan with the explanations that will be mentioned in the up coming issues. Issue 547: Fasting is that to which God has commanded man for obedience to restrain from those things which invalidate the fast, from the Azaan of the morning prayer (Fajr) until evening prayer (Maghrib)