﴿ أَيَّامًۭا مَّعْدُودَٰتٍۢ ۚ فَمَن كَانَ مِنكُم مَّرِيضًا أَوْ عَلَىٰ سَفَرٍۢ فَعِدَّةٌۭ مِّنْ أَيَّامٍ أُخَرَ ۚ وَعَلَى ٱلَّذِينَ يُطِيقُونَهُۥ فِدْيَةٌۭ طَعَامُ مِسْكِينٍۢ ۖ فَمَن تَطَوَّعَ خَيْرًۭا فَهُوَ خَيْرٌۭ لَّهُۥ ۚ وَأَن تَصُومُوا۟ خَيْرٌۭ لَّكُمْ ۖ إِن كُنتُمْ تَعْلَمُونَ ﴾

“[fasting] during a certain number of days. But whoever of you is ill, or on a journey, [shall fast instead for the same] number of other days; and [in such cases] it is incumbent upon those who can afford it to make sacrifice by feeding a needy person. And whoever does more good than he is bound to do does good unto himself thereby; for to fast is to do good unto yourselves - if you but knew it.”

((Fast) a certain number of days) 30 days; (and (for) him who is sick among you, or on a journey, (the same) number of other days) let him fast the same number of days he missed; (and for those who can afford it) afford to fast (there is a ransom: the feeding of a man in need-) let him feed a person in need, instead of every day of the fast that he missed, half a measure of wheat. But this is abrogated by Allah's saying: (And whoever of you is present, let him fast the month). It is also said that this means: those who can afford a ransom and are not able to fast, old men and women who are unable to fast, they should feed a needy person, for every missed day of fast in Ramadan, half a measure of wheat. (But whoso doeth good of his own accord) gives more than two pounds, (it is better for him) in terms of reward: (and that ye fast is better for you) than giving ransom (if ye did but know-)