Riyad as-Salihin (The Meadows of the Righteous)
by Imam Nawawi
1712. Ibn Mas'ud reported that the Prophet, may Allah bless him and grant him peace, said, "Anyone who swears an oath to get hold of some property belonging to a Muslim to which he has no right will meet Allah and find Him angry with him." Then the Messenger of Allah may Allah bless him and grant him peace, recited to us confirmation of this from the Book of Allah, the Mighty and Majestic, "Those Allah 's contract and their own oaths for a paltry price..." to the end of the ayat (3:77). [Agreed upon]
1713. Abu Umama Iyas ibn Tha'laba al-Harithi reported that the Messenger of Allah may Allah bless him and grant him peace, said, "If anyone cuts off the right of a Muslim man by an oath he makes, Allah has made the Fire mandatory for him and forbidden him the Garden.' A man said to him, 'Even if it is something insignificant, Messenger of Allah?' He said, 'Even if it is only a piece of arak-stick.'" [Muslim]
1714. 'Abdullah ibn 'Amr ibn al-'As reported that the Prophet may Allah bless him and grant him peace, said, "The major sins are: associating something else with Allah, disobedience to parents, murder and making false oaths." [al-Bukhari]
In one variant, a bedouin came to the Prophet, may Allah bless him and grant him peace, and said, "Messenger of Allah, what are the major sins?" He said, "Associating something else with Allah." He said, "Then what?" He said, "Making false oaths." I said, "What is a false oath." He said, "That by which the property of a Muslim man is misappropriated," meaning that someone lies in the oath.