Allah will not take you to task for the unintentional (or futile) word in your oaths (or promises), but He will take you task for oaths you swear in earnest. The expiation thereof is to feed ten poor men with the average food you feed your families with, or to clothe them, or to free a slave; but he who has not the means, then let him fast three days. That is the expiation of your oaths, when you have sworn; but keep your oaths. Thus does Allah explain to you His revelations that you may be grateful.