The Prophet (saws) used to say: "O Allah, I seek refuge in Thee from leprosy, madness, elephantiasis, and evil diseases."

Yahya related to me from Malik from Yahya ibn Said that Said ibn al-Musayyab had said that Umar ibn al-Khattab said, "If a man marries a woman who is insane, or has leprosy or white leprosy, without being told of her condition by her guardian, and he has sexual relations with her, she keeps her bride-price in its entirety. Her husband has damages against her guardian."

Malik said, "The husband has damages against her guardian when the guardian is her father, brother, or one who is deemed to have knowledge of her condition. If the guardian who gives her in marriage is a nephew, a mawla or a member of her tribe who is not deemed to have knowledge of her condition, there are no damages against him, and the woman returns what she has taken of her bride-price, and the husband leaves her whatever amount is thought to be fair."

Yahya related to me from Malik from Abdullah ibn Abi Bakr ibn Muhammad ibn Amr ibn Hazm that Aban ibn Uthman and Hisham ibn Ismail used to mention in their khutbas built-in liability agreements in the sale of slaves, to cover both a three day period and a similar clause covering a year. Malik explained, "The defects a lave or slave-girl are found to have from the time they are bought until the end of the three days are the responsibility of the seller. The year agreement is to cover insanity, leprosy, and loss of limbs due to disease. After a year, the seller is free from any liability."

Malik said,"An inheritor or someone else who sells a slave or slave-girl without any such built-in guarantee is not responsible for any fault in the slave and there is no liability agreement held against him unless he was aware of a fault and concealed it. If he was aware of a fault, the lack of guarantee does not protect him. The purchase is returned. In our view, built-in liability agreements only apply to the purchase of slaves."

Allah's Apostle said, "(The Prophet) Moses was a shy person and used to cover his body completely because of his extensive shyness. One of the children of Israel hurt him by saying, 'He covers his body in this way only because of some defect in his skin, either leprosy or scrotal hernia, or he has some other defect.' Allah wished to clear Moses of what they said about him, so one day while Moses was in seclusion, he took off his clothes and put them on a stone and started taking a bath. When he had finished the bath, he moved towards his clothes so as to take them, but the stone took his clothes and fled; Moses picked up his stick and ran after the stone saying, 'O stone! Give me my garment!' Till he reached a group of Bani Israel who saw him naked then, and found him the best of what Allah had created, and Allah cleared him of what they had accused him of. The stone stopped there and Moses took and put his garment on and started hitting the stone with his stick. By Allah, the stone still has some traces of the hitting, three, four or five marks. This was what Allah refers to in His Saying:-- "O you who believe! Be you not like those Who annoyed Moses, But Allah proved his innocence of that which they alleged, And he was honorable In Allah's Sight." (33.69)