Abdullah bin Mubarak عبد الله بن المبارك · The Book of Oaths and Vows

"I heard my father Ka'b bin Malik narrate: 'I said: O Messenger of Allah, Allah, the Mighty and Sublime, has saved me by my being truthful, and as part of my repentance I want to give my wealth in charity to Allah and His Messenger. He said: Keep some of your wealth for yourself; that is better for you. I said: I will keep my share that is in Khaibar.'"

The Messenger of Allah said: "There is no vow to commit an act of disobedience and its expiation is the expiation for an oath." Mansur bin Zadhan contradicted him in his wording.

The Messenger of Allah said: "There is no vow for the son of Adam with regard to that which he does not possess, or to do an act of disobedience to Allah, the Mighty and Sublime." 'Ali bin Zaid contradicted him -for he reported it from Al-Hasan from 'Abdur-Rahman bin Samurah.

"There is no vow to commit an act of disobedience or with regard to that which the son of Adam does not possess."

The Messenger of Allah said: "There is no vow to commit an act of disobedience or with regard to that which the son of Adam does not possess."

"The Prophet saw a man being supported by two others and said: 'What is this?' They said: 'He vowed to walk to the House of Allah.' He said: 'Allah has no need for this man to torture himself. Tell him to ride.'"