Abdullah bin Abbas (may Allah be pleased with them both) narrates: The Prophet Muhammad (peace be upon him) said: "Avoid marrying four types of people: those with insanity (madness), leprosy, and vitiligo (white patches)."

Sayyiduna Ali (may Allah be pleased with him) narrates: The Noble Prophet (peace and blessings of Allah be upon him) instructed the widow that "if she wishes, she may observe her waiting period (‘iddah) at a place other than her home." No one except Abu Malik Nakhai has narrated this report with a chain of transmission, and this narrator is weak. The other narrator of this report, Mahbub (bin Mahraz Tamimi), is also weak.

Sayyiduna Umar bin Khattab (may Allah be pleased with him) said: "If a woman is married to a man by deception, and that woman has insanity, leprosy, or vitiligo, then the woman will receive the dowry, because the man has had relations with her, and the man will recover the amount of the dowry from the woman's guardian who arranged the marriage by deception."

Saeed bin Musayyib narrates: Sayyiduna Umar (may Allah be pleased with him) gave the verdict regarding a woman afflicted with leukoderma, leprosy, or insanity that if her husband has intercourse with her, then separation will be established between the husband and wife. The woman will receive the dowry because of the husband's intercourse, and the man will recover that dowry from the woman's guardian.

Sayyiduna Abdullah bin Abbas (may Allah be pleased with them) said: There are four types of women (if they are slave women) whom it is not permissible to sell, and (whether free or slave) it is not permissible to marry them: a mad woman, a woman afflicted with leprosy, a woman afflicted with vitiligo, and a woman suffering from swelling of the private parts.

Sayyiduna Ali (may Allah be pleased with him) said: "If a person marries a woman who is insane, afflicted with leprosy, afflicted with leukoderma, or a woman with an obstruction in her private part, then that woman will be considered his wife. If the man wishes, he may keep her with him, otherwise he may divorce her."

Amr bin Shu'aib narrates from his father, from his grandfather: Sayyiduna Amr bin al-As (may Allah be pleased with him) wrote to Sayyiduna Umar bin Khattab (may Allah be pleased with him) regarding continuous (absence), due to which there was a fear of harm to his wife. Sayyiduna Umar bin Khattab (may Allah be pleased with him) wrote back to him: "Give him a respite of one year; if he recovers, then fine, otherwise separation should be effected between him and his wife."

Sayyidah Aisha (may Allah be pleased with her) narrates: The Noble Prophet (peace and blessings be upon him) said: "No lawful thing becomes invalid due to any unlawful thing."

Sayyidah Aisha (may Allah be pleased with her) narrates: The Noble Prophet (peace and blessings be upon him) was asked about a person who commits a forbidden act with a woman and then later marries her daughter, or after committing a forbidden act with a woman, later marries her mother. The Noble Prophet (peace and blessings be upon him) said: "No forbidden thing makes anything lawful forbidden."

Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates this statement of the Noble Prophet (peace and blessings be upon him): "No unlawful thing makes any lawful thing unlawful."