And if a man wants to take a concubine and his wife says to him "I will kill myself," he is not prohibited [from doing so], because it is a lawful act, but if he abstains to save her grief, he will be rewarded, because of the hadith "Whoever sympathises with my community, God will sympathise with him."
A 17th century Hanafi scholar, Imam Haskafi, writes in his jurisprudential work Al-Durr al-Mukhtar. Kecia Ali (21 December 2015). Sexual Ethics and Islam: Feminist Reflections on Qur'an, Hadith and Jurisprudence. Oneworld Publications. ISBN 978-1-78074-853-5. p.50
The citations attributed to early authorities suggest that sexual slavery was seen as a matter of privilege; a male privilege as well as a privilege of the conqueror over a conquered people—which is demonstrated by an interest in slave ethnicities. According to contemporaneous Islamic legal writings, men had a number of privileges over women; sexual pleasure was one of them.
— Pernilla, Myrne (2019). "Slaves for Pleasure in Arabic Sex and Slave Purchase Manuals from the Tenth to the Twelfth Centuries". Journal of Global Slavery. 4: 196–225. doi:10.1163/2405836X-00402004 p. 203
The master could sell her or give her away as a gift. The concubine could not own property, because her master owned everything, although she could carry out a trade or business by herself. Levy described the concubine saying "She has no more right than other chattels". She could be paid compensation for an attack, which resulted in the death of a baby. Also her master could pass her on to his heir as an inheritance.
— Saad, Salma (1990). The legal and social status of women in the Hadith literature. University of Leeds, p. 245
These were the most fortunate captive women, who held high a position in the life of the Prophet. Therefore, it can be said that the destiny of a captive woman depended on two points: a. if her tribe was able to pay the ransom b. if she was married to her captor. Sometimes neither of these events might occur and therefore the woman suffered and was humiliated because her captor or the one who bought her, had control of both her body and her life. He might keep her as a concubine if she was beautiful and young, or might use her as a servant if she was old and ugly. He had the right to sell her to anyone who was willing to pay her price. On this account some references mentioned captives, who committed suicide
— Saad, Salma (1990). The legal and social status of women in the Hadith literature. University of Leeds, p. 248
Women slaves turned concubines could increase the Muslim population by leaps and bounds when captured in large numbers.
Arnold TW (1896) The Preaching of Islam, Westminster, p. 365 . as quoted in Khan, M. A. (2011). Islamic Jihad: A legacy of forced conversion, imperialism and slavery.