Question 6: I vowed to fast the whole month of Rajab, as the people in my country are used to honor this month more than any other month, except that of Ramadaan. Since then, I have not fulfilled that vow because of being busy with life matters. Whenever I postpone Sawm (Fast) to the following year, I become more preoccupied and could not fulfill my vow. Now, am I obliged to fast the month of Rajab, or it is permissible for me to fast any other month? I am a diabetic and I become very tired by the time Ramadaan comes to an end. Is it lawful for me to feed Miskins (needy people) as Kaffaarah (expiation) for my unfulfilled vow? I only know one poor family; could I give its member all the food that must be given to ten Miskeens? If not, should I give the food to a charitable society, such as the society of `Abdul-`Azeez? Is it preferable to pay money or give food such as rice?If feeding is not permissible to expiate for broken vows, is it permissible to observe Sawm for ten separate days each month, for example? Kindly give us your Fatwaa (legal opinion issued by a qualified Muslim scholar) in this regard. May Allaah reward you with the best!
Answer: You must offer Kaffaarah for breaking an oath, because singling out Rajab for Sawm is an act of Jahiliyyah (pre-Islaamic time of ignorance)… read more here.