if one cannot set free a slave he must fast for two consecutive months and only then can he have lawful carnal relations. if this is also not possible he must feed sixty destitute people. this is the command of god so that perhaps you will have faith in god and his messenger. such are the laws of god and those who disbelieve them will suffer a painful torment.
فمن لم يجد فصيام شهرين متتابعين من قبل أن يتماسا فمن لم يستطع فإطعام ستين مسكينا ذلك لتؤمنوا بالله ورسوله وتلك حدود الله وللكافرين عذاب أليم