Hazrat Abu Huraira (may Allah be pleased with him) and Zaid bin Khalid (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) was asked, "If an unmarried slave-girl commits adultery (what is the ruling for her)?" The Prophet (peace and blessings be upon him) said, "Flog her." If she commits adultery again, then flog her again. If she still commits adultery, then sell her, even if it is in exchange for only a rope.