2:184
أَيَّامًا مَّعْدُودَٰتٍ فَ مَن كَانَ مِن كُم مَّرِيضًا أَوْ عَلَىٰ سَفَرٍ فَ عِدَّةٌ مِّنْ أَيَّامٍ أُخَرَ وَ عَلَى ٱلَّذِينَ يُطِيقُ ونَ هُۥ فِدْيَةٌ طَعَامُ مِسْكِينٍ فَ مَن تَطَوَّعَ خَيْرًا فَ هُوَ خَيْرٌ لَّ هُۥ وَ أَن تَصُومُ وا۟ خَيْرٌ لَّ كُمْ إِن كُن تُمْ تَعْلَمُ ونَ
[Fasting for] a limited number of days. So whoever among you is ill or on a journey [during them] - then an equal number of days [are to be made up]. And upon those who are able [to fast, but with hardship] - a ransom [as substitute] of feeding a poor person [each day]. And whoever volunteers excess - it is better for him. But to fast is best for you, if you only knew.