It was narrated from Samurah bin Jundab that the Messenger of Allah ( صلی اللہ علیہ وسلم ) said: "The contractual obligation regarding a slave lasts for three days." (1)

It was narrated from 'Uqbah bin 'Amir that the Messenger of Allah ( صلی اللہ علیہ وسلم ) said: "There is no contractual obligation after four (days)."

It was narrated that 'Uqbah bin 'Amir said: "I heard the Messenger of Allah ( صلی اللہ علیہ وسلم ) say: 'The Muslim is the brother of another Muslim, and it is not permissible for a Muslim to sell his brother goods in which there is a defect, without pointing that out to him."'

It was narrated that Wathilah bin Asqa' said: "I heard the Messenger of Allah ( صلی اللہ علیہ وسلم ) say: 'Whoever sells defective goods without pointing it out, he will remain subject to the wrath of Allah, and the angels will continue to curse him.'"

It was narrated that 'Abdullah bin Mas'ud said: "When captives were brought to him, the Prophet ( صلی اللہ علیہ وسلم ) would give the members of one family together (to one person), not wanting to separate them."

It was narrated that 'Ali said: "The Messenger of Allah ( صلی اللہ علیہ وسلم ) gave me two slaves who were brothers, and I sold one of them. He said: 'What happened with the two slaves?' I said: 'I sold one of them.' He said: 'Take him back."'

It was narrated that Abu Musa said: "The Messenger of Allah ( صلی اللہ علیہ وسلم ) cursed the one who separates a mother and her child, or a brother from his brother."

It was narrated that 'Abdul-Majid bin Wahb said: "Adda' bin Khalid bin Hawdhah said to me: 'Shall I not read to you a letter that the Messenger of Allah ( صلی اللہ علیہ وسلم ), wrote to me?' I said: 'Yes.' So he took out a letter. In it was: 'This is what 'Adda' bin Khalid bin Hawdhah bought [from] Muhammad the Messenger of Allah ( صلی اللہ علیہ وسلم ) He bought from him a slave' or 'a female slave, having no ailments, nor being a runaway, not having any malicious behavior. Sold by a Muslim to a Muslim.'"

It was narrated from 'Amr bin Shu'aib from his father that his grandfather told that the Messenger of Allah ( صلی اللہ علیہ وسلم ) said: "When anyone of you buys a slave woman let him say: 'Allahumma inni as'aluka khairaha wa khaira ma jabaltaha alaihi, wa a'udhu bika min sharriha wa sharri ma jabaltaha alaihi (O Allah, I ask You for the goodness within her and the goodness that You have made her inclined towards, and I seek refuge with You from the evil within her and the evil that You have made her inclined towards).' And he should pray for blessing. And if anyone of you buys a camel then he should take hold of its hump and pray for. blessing and say similar words."

It was narrated that Malik bin Aws bin Hadathan Nasri said: "I heard 'Umar bin Al-Khattab say: 'The Messenger of Allah ( صلی اللہ علیہ وسلم ) said: "Exchanging gold for gold is usury unless it is done on the spot. (Exchanging) wheat for wheat is usury, unless it is done on the spot. (Exchanging) barley for barley is usury unless it is done on the spot. (Exchanging) dates for dates is usury, unless it is done on the spot."