“O you who believe, fasting is prescribed for you, as it was prescribed for those before you, that you may (learn) self-restraint.”

“(Fasting) for a fixed number of day; 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 you fast, if you only knew.”

“Ramadan is the (month) in which was sent down the Qur’an, as a Guide to mankind, also clear (signs) for guidance and judgment (between right and wrong). So every one of you who is present (at home) during that month should spend it in fasting, but if anyone is ill, or on a journey, the prescribed period (should be made up) by days later. Allah intends every facility for you; He does not want to put you to difficulties. (He wants you) to complete the prescribed period, and to glorify Him in that He has guided you; and perchance you shall be grateful.”

Holy Qur’an 2:183-185