Surah 2, Verse 184

Fast a (fixed) number of days, but if someone is ill or is travelling (he should complete) the number of days (he had missed); and those who find it hard to fast should expiate by feeding a poor person. For the good they do with a little hardship is better for men. And if you fast it is good for you, if you knew.

— Quran 2:184

Quote from Quran 2:184