She swore to leave her husband – what is the ruling on that?
Question

                I am a married woman, and recently there have been some arguments between me and my husband, which lead us to get angry. During the arguments I swore by Allaah that I would leave him (my husband), but afterwards that did not happen. I would like you to tell me what I should do so that my relationship with my husband will be proper according to sharee’ah.
Praise be to Allah.The oath to 
    leave your husband does not affect the marital relationship between you, 
    because separation and divorce are in the husband’s hands, not the wife’s. 
    If a woman clearly states the words of divorce, that does not have any 
    effect. 
Each of you 
    should treat the other kindly, and avoid speaking of separation altogether, 
    because the husband may be provoked by his wife’s saying that, and then he 
    may issue a divorce. This is what the shaytaan wants and strives for, so as 
    to destroy the family and destroy the home. Also, if one spouse feels that 
    he does not want the other to stay with him, this is offensive and may cause 
    trouble, so that must be avoided as much as possible. 
    With regard to your swearing to separate from your husband, it is better not 
    to do that, because divorce is hated by Allaah. It is better for you to stay 
    with your husband, and you have to offer kafaarat yameen (expiation for 
    breaking an oath). 
The Prophet 
     (peace and blessings of Allaah be upon him) said: “Whoever swears an 
    oath then sees that something else is better than it, let him do that which 
    is better, and offer expiation for his oath.” Narrated by Muslim (1650). 
The 
    expiation for breaking an oath is that which is mentioned in the verse in 
    which Allaah says (interpretation of the meaning): 
“Allaah 
    will not punish you for what is unintentional in your oaths, but He will 
    punish you for your deliberate oaths; for its expiation (a deliberate oath) 
    feed ten Masaakeen (poor persons), on a scale of the average of that with 
    which you feed your own families, or clothe them or manumit a slave. But 
    whosoever cannot afford (that), then he should fast for three days. That is 
    the expiation for the oaths when you have sworn. And protect your oaths 
    (i.e. do not swear much). Thus Allaah makes clear to you His Ayaat (proofs, 
    evidences, verses, lessons, signs, revelations, etc.) that you may be 
    grateful”
    [al-Maa’idah 5:89]
See also the 
    answer to question no. 45676. 
We ask 
    Allaah to reconcile between you and your husband and to bring you together 
    in goodness and guidance. 
And Allaah knows 
    best.