The Prophet (ﷺ) said: Any woman who is married by two guardians (to two different men) belongs to the first woman who is married by two guardians (to two different men) belongs to the first of them and anything sold by a man to two persons belongs to the first of them.
The Prophet (ﷺ) said: One of you must not ask a woman in marriage when his brother has done so already, and one of you must not sell (his own goods) when his brother has already sold (his goods) except with his permission.
The Prophet (ﷺ) said: When one of you asked a woman in marriage, if he is able to look at what will induce him to marry her, he should do so. He (Jabir) said: I asked a girl in marriage, I used to look at her secretly, until I looked at what induced me to […]
The Messenger of Allah (ﷺ) said: The marriage of a woman who marries without the consent of her guardians is void. (He said these words) three times. If there is cohabitation, she gets her dower for the intercourse her husband has had. If there is a dispute, the sultan (man in authority) is the guardian […]
This tradition has also been transmitted by A’ishah through a different chain of narrators from the Prophet (ﷺ) to the same effect. Abu Dawud said “Ja’far did not hear any tradition from Al Zuhri. Al Zuhri gave him his writing.”
The Prophet (ﷺ) said: If any slave marries without the permission of his masters, he is a fornicator.
Ibn ‘Umar reported the Prophet (ﷺ) as saying “If a slave marries without the permission of his master, his marriage is null and void. Abu Dawud said “This tradition is weak. This is mauquf(does not go back to the Prophet). This is the statement of the Ibn ‘Umar himself.
Abu Hurairah reported the Apostle of Allaah(ﷺ) as saying “ A man should not seek the hand of a woman in marriage when his brother has already sought her hand.”
The aforesaid tradition has also been transmitted by ‘Ali through a different chain of narrators from the Prophet (ﷺ) to the same effect.
Al-Abbas ibn Abdullah ibn al-Abbas married his daughter to Abdur Rahman ibn al-Hakam, and AbdurRahman married his daughter to him. And they made this (exchange) their dower. Mu’awiyah wrote to Marwan commanding him to separate them. He wrote in his letter: This is the shighar which the Messenger of Allah (ﷺ) has forbidden.