How to Make the Atonement for an Oath
Question :
The atonement for an oath is to feed ten poor persons. Is feeding them one time sufficient? And is it permis- sible to give them food before it is cooked? And what is the amount of it?
Answer:
Feeding them one time is sufficient - Allah Willing. The required amount is a lunch or dinner that is fed to them until they are satisfied. If he gave them uncooked food, the amount given to each poor person would be one and a half kilograms of rice. It is also better to give them whatever benefits them, just as he would give his family (such as meat, salad, bread etc.), according to the Words of Allah, Most High:
"for its expiation (a deliberate oath) feed ten Masäkin (poor persons), on a scale of the average of that with which you feed your own families."
-i.e., of the usual food which you and your family eat.
Source:
Ibn Jibreen
Fatawa Islamiyah, Vol. 6 Pages 396-397