It is narrated from Hazrat Sa’d bin Al-Akhram that a man came to Hazrat Ibn Mas’ud (may Allah be pleased with him) and said: I have freed my slave-girl, and I have set a condition upon her that she will serve me as a slave serves her master, except for sexual relations. Then, when I was strict with her in her servitude, she says that she is free. He (Ibn Mas’ud) said: She does not have the right to say this. Take her and make her fulfill the condition you have set upon her; it is necessary for her to fulfill it.