183. O you who believe! Observing As-Saum (the fasting)[1] is prescribed for you as it was prescribed for those before you, that you may become Al-Muttaqûn (the pious - See V.2: 2).
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(V.2:183) As-Saum means fasting i.e. not to eat or drink or have sexual relations etc. from the Adhân of the Fajr (early morning) prayer till the sunset.