Muhammad bin Ja'far Ghandar محمد بن جعفر غندر صاحب الكرابيس · The Book of Oaths and Vows

"The Messenger of Allah said: 'Do not swear by your fathers, nor by your mothers nor by the idols. Swear only by Allah, and do not swear unless you are sincere.'"

"The Messenger of Allah said: 'There is no vow to commit an act of disobedience, and its expiation is the expiation for an oath.'"

"The Messenger of Allah said: 'Whoever swears an oath and says: "If Allah wills, then he has made an exception."'"