Maliks Muwatta Book 31, Hadith Number 7.

Section : Prohibition against Intercourse with Slave-Girls Who Have Husbands.

Yahya related to me from Malik from Ibn Shihab that Abdullah ibn Amir gave Uthman ibn Affan a slave-girl who had a husband whom he had purchased at Basra. Uthman said, “I will not go near her until her husband separates from her.” Ibn Amir compensated the husband and he separated from her.