Note:
If someone takes an oath that he will not have sexual intercourse with his wife, the case has four situations:
(A) No time-limit was fixed.
(B) A time-limit of four months was fixed.
(C) A time-limit of more than four months was fixed.
(D) The limit was identified as less than four months.
So, situations A, B and C are termed in Shari` ah as 'Ild' (ایلاء ). The injunction covering these situations is: If the oath-taker breaks his oath within four months and resumes sexual intercourse with his wife, he will have to come up with kaffarah کَفَّارہ for his oath while his nikah (marriage) remains intact. And should it be that the time-limit of four months did expire and the oath-taker did not break his oath, an irrevocable divorce on his wife will become effective, that is, taking her back without remarriage does not remain correct any more. However, if they, by mutual consent, enter into marriage this will be correct. Halalah حلالہ (an intermediary marriage of the woman with a third person) is not required. The injunction in the fourth situation is: If the oath is broken, kaffarah کَفَّارہ will be required and if the oath is completed, the marriage, even then, will remain valid. (Bayan al-Qur°an)