Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) says: (Allah Almighty has said) "For those who are unable to do so, the compensation is to feed a poor person." Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) says: Those who are unable to do so are obligated to feed a poor person, and whoever wishes to do good voluntarily, then let him feed an additional poor person. This ruling is not abrogated; rather, it is better for him. And if you fast, that is better for you. So in this matter, concession is given only to that elderly man who is unable to fast and to that sick person who knows that he will never recover. Its chain of narration is authentic.