Quran

 2:184

أَيَّامًا مَعْدُودَاتٍ ۚ فَمَنْ كَانَ مِنْكُمْ مَرِيضًا أَوْ عَلَىٰ سَفَرٍ فَعِدَّةٌ مِنْ أَيَّامٍ أُخَرَ ۚ وَعَلَى الَّذِينَ يُطِيقُونَهُ فِدْيَةٌ طَعَامُ مِسْكِينٍ ۖ فَمَنْ تَطَوَّعَ خَيْرًا فَهُوَ خَيْرٌ لَهُ ۚ وَأَنْ تَصُومُوا خَيْرٌ لَكُمْ ۖ إِنْ كُنْتُمْ تَعْلَمُونَ ﴿١٨٤﴾

184. For a specified number of days. But whoever among you is sick or traveling, then a number of other days. For those who are able: a ransom of feeding a needy person. But whoever volunteers goodness, it is better for him. But to fast is better for you, if you only knew.