Hazrat Mahdi (as) will uphold the truthagainst cruelty

Hazrat Mahdi (as) will defend the truth against the oppressors. Indeed, he will extract the molar tooth [anything unjustly held] of a [cruel] person and restore it to its rightful owner. (Al-Uqayli, An-Najmu's-saqib fi Bayan Anna'l Mahdi min Awladi Ali b. Abu Talib Ale't-Tamam wa al-Qamal)