Sayyidah Aishah (may Allah be pleased with her) says that the Messenger of Allah (peace and blessings be upon him) said: "Conditions that are not in the Book of Allah are void, even if they are a hundred."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10827
Amr bin Shu'ayb narrates from his father, and he from his grandfather (Sayyiduna Abdullah bin Amr, may Allah be pleased with them both), that "the Messenger of Allah (peace and blessings be upon him) forbade a loan combined with a sale, two conditions in one sale, selling something that you do not have, and taking profit on something for whose loss one does not bear responsibility."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10828
Ubaydullah bin Abdullah bin Utbah bin Mas'ud (may Allah have mercy on him) says that Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) bought a slave-girl from his wife Zaynab (may Allah be pleased with her). She made the condition: If you wish to sell her, then take from me the same price for which you would sell her. He said about this: I sought a ruling from Sayyiduna Umar bin al-Khattab (may Allah be pleased with him), and he said: Do not go near her, for there is a condition in her in favour of someone.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10829
Hadith Gradingمحدثین:ضعيف
Hadith Takhrij«ضعيف۔ اخرجه مالك 1275۔ عبدالرزاق 14291»
Nafi' narrates from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that a man should not have intercourse with a slave-girl except one whom he may sell if he wishes, give away if he wishes, or do with whatever he wishes.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10830
Nafi' narrates from Ibn Umar (may Allah be pleased with them both) that he said: "It is not lawful for a man to have intercourse with a slave-girl except one whom, if he wishes, he may give away, if he wishes, sell, and if he wishes, set free, with no condition attached to her."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10831