One who is obligated to feed others may do so at any time

Question: A questioner says: I am afflicted with epilepsy, and I was unable to fast the blessed month of Ramadan because I have to continue my treatment three times a day. I tried fasting for two days but was unable to do so. Please note that I am retired, and my pension amounts to eighty-three dinars per month. I have a wife, and I have no income other than my pension. What is the ruling of the Shari'ah in my case if I am unable to feed thirty poor people during the month of Ramadan? What is the amount I must pay?

Answer: If this illness that has befallen you is expected to end one day, then it is obligatory for you to wait until the illness ends and then fast; based on the saying of Allah the Exalted: [al-Baqarah:185].
As for if this illness is continuous and its end is not expected, then it is obligatory for you to feed one poor person for every day. It is permissible for you to prepare a lunch or dinner and invite poor people equal in number to the days of the month, and thereby you will be absolved of your obligation. I do not think anyone would be unable to do this, if Allah wills. There is no blame on you if you are unable to feed these poor people in one month. There is no blame on you if you feed some of them in one month, some in another month, and some in yet another month, according to your ability. And Allah knows best.