Tawus bin Kaysan طاوس · The Book of Oaths and Vows

"They do not bring any good; they are just a means of taking wealth from the miserly."

"The Messenger of Allah forbade vows and said: 'They do not change anything; they are just a means of taking wealth from the miserly.'"

My father told me that a man told him, that he asked 'Imran bin Husain about a man who made a vow not to attend the prayers in the mosque of his people. 'Imran said: I heard the Messenger of Allah say: There is no vow at a moment of anger and its expiation is the expiation for an oath.

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