Yahya related to me from Malik from Nafi that Abdullah ibn Umarwould say, "A man should not have intercourse with a slave girl exceptone whom, if he wished, he could sell, if he wished, he could giveaway, if he wished, he could keep, if he wished, he could do with herwhat he wanted ."Malik said that a man who bought a slave-girl on condition that he did not sell her, give her away, or dosomething of that nature, was not to have intercourse with her. Thatwas because he was not permitted to sell her or to give her away, soif he did not own that from her, he did not have complete ownership ofher because an exception had been made concerning her by the hand ofsomeone else. If that sort of condition entered into it, it was amessy situation, and the sale was not recommended.
USC-MSA web (English) reference: Book 31, Hadith 6
Arabic reference: Book 31, Hadith 1298