792 Vows of penance or abstention may sometimes be futile, or even stand in the way of really good or virtuous act. See
2:224-226, and notes. The general principles established are: (1) take no futile oaths; (2) use not Allah's name, literally or in intention, to fetter yourself against doing a lawful or good act; (3) keep to your solemn oaths to the utmost of your ability; (4) where you are unable to do so, expiate your failure by feeding or clothing the poor, or obtaining some one's freedom, or if you have not the means, by fasting. This is from a spiritual aspect. If any party suffers damage from your failure, compensation will be due, but that would be a question of law or equity.