You use the word «blameless» - free of guilt; not subject to blame: synonyms: innocent, guiltless, above reproach,
irreproachable, unimpeachable, in the clear, exemplary, perfect, virtuous, pure, impeccable, faultless; The
master is only «blameless» if he was chastising the slave as was customary and not to cause harm but correct behavior or consequence for criminal behavior.