Muhammad bin 'Ubaid al-Tanafasi محمد بن عبيد بن أبي أمية الطنافسي · The Book of Oaths and Vows

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.

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."