'Ali (RAA) narrated that the Messenger of Allah (ﷺ) said:
"Inflict the prescribed punishment to those whom you possess (i.e. your slaves)." Related by Abu Dawud and Muslim (but only traced to the Companion). (FR)
English reference (FR): Book 10, Hadith 1250 (FR)
Arabic reference (FR): Book 10, Hadith 1211 (FR)