Silsilah as-Sahihah 1205 — Legal punishment for slaves and slave girls

It is narrated from Sayyidah Aisha (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: "When a slave-girl commits adultery, flog her; if she commits adultery again, flog her; if she commits adultery again, flog her; and if she commits adultery again, flog her and sell her, even if you have to sell her for a twisted rope."