Illegality of Swearing Falsely

Imam Al-Nawawi’s Riyad-us-Saliheen
Chapter 315
Illegality of Swearing Falsely

1712. Ibn Mas`ud (May Allah be pleased with him) said: The Prophet (sallallaahu ’alayhi wa sallam) said, “He who takes oath to acquire the property of a Muslim unjustly will meet Allah and He will be angry with him” then he recited:
Verily, those who purchase a small gain at the cost of Allah’s Covenant and their oaths, they shall have no portion in the Hereafter. Neither will Allah speak to them nor look at them on the Day of Resurrection nor will He purify them, and they shall have a painful torment.” (3:77)
[Al-Bukhari and Muslim].

1713. Abu Umamah Iyas bin Tha`labah Al-Harithi (May Allah be pleased with him) said: The Messenger of Allah (sallallaahu ’alayhi wa sallam) said, “He who misappropriates the right of a Muslim by taking a false oath, Allah will condemn him to the fire of Hell and will forbid Jannah for him.” A person asked: “O Messenger of Allah, even if it is something insignificant?” He replied, “Yes, even if it is the twig of the Arak tree.”
[Muslim].

1714. `Abdullah bin `Amr bin Al-As (May Allah be pleased with them) said: The Prophet (sallallaahu ’alayhi wa sallam) said, “Of the major sins are: Associating anything in worship with Allah, disobedience to the parents, killing without justification and taking a false oath (intentionally).
[Al-Bukhari].

Another narration is: A bedouin came to the Prophet (sallallaahu ’alayhi wa sallam) and asked him: “O Messenger of Allah, what are the cardinal sins?” He (sallallaahu ’alayhi wa sallam) replied, “Associating anything with Allah in worship.” The man asked: “(What is) next?” The Messenger of Allah (sallallaahu ’alayhi wa sallam) replied, “Al-Yamin Al-Ghamus.” He asked: “What do you mean by Al-Yamin Al-Ghamus?” The Messenger of Allah (sallallaahu ’alayhi wa sallam) replied, “Swearing falsely to usurp the property of a Muslim.