Due to sickness or other reasons, we might have missed some days of fasting in Ramadan. When is the best time to make up those fasts, and when do we have to pay fidyah or kaffrah, the amounts paid in place of making up fasts?
We Muslims fast the month of Ramadaan because Allaah has commanded us to do so. Allaah says (interpretation of the meaning): “ O you who believe! Observing As-Sawm (the fasting) is prescribed for you as it was prescribed for those before you, that you may become Al-Muttaqoon (pious)” [al-Baqarah 2:183]
Fasting on the Day of Arafah: Fasting is highly encouraged and recommended for those not going on hajj. "Fasting on the Day of Arafah expiates the sins of the past year and the coming year.