the Almighty: {And they swear to falsehood while they know} (61). Because lying is forbidden, and when it is the subject of an oath, it is more severe in its prohibition. If one invalidates a right through it, or seizes the wealth of an inviolable person, it is even more severe; for it has been narrated from the Prophet (peace and blessings of Allah be upon him) that he said: "Whoever swears a false oath to seize the wealth of a Muslim man through it will meet Allah while He is angry with him." [Agreed upon] (62). Allah, the Almighty, revealed concerning that: {Indeed, those who exchange the covenant of Allah and their oaths for a small price, they have no share in the Hereafter, and Allah will not speak to them or look at them on the Day of Resurrection, nor will He purify them, and for them is a painful punishment} (63). From this category is swearing to perform an act of disobedience or to abandon an obligatory act; for the subject of the oath is forbidden, so the oath is forbidden because it is a means to it, and the means takes the ruling of the end it leads to.

Section: Whenever an oath is concerning the performance of an obligatory act or the abandonment of a prohibited one, its breaking is prohibited, because breaking it implies the performance of the prohibited act, which is unlawful. If it is concerning the performance of a commendable act or the abandonment of a disliked one, then breaking it is disliked. If it is concerning the performance of (64) a permissible act, then breaking it is permissible. If it is said: How can breaking it be permissible when Allah, the Almighty, has said: {And do not break oaths after their confirmation} (65)? We respond: This refers to oaths in covenants and treaties, based on the evidence of His saying, the Almighty: {And fulfill the covenant of Allah when you have made a covenant and do not}