Plato, Laws 936d

μὴ συναιτίου τοῦ βλαβέντος αὐτοῦ γενομένου κατʼ ἀπειρίαν ἤ τινʼ ἑτέραν χρείαν μὴ σώφρονα, ὁ τοῦ βλάψαντος δεσπότης ἢ τὴν βλάβην ἐξιάσθω μὴ ἐνδεῶς, ἢ τὸν βλάψαντʼ αὐτὸν παραδότω· ἐὰν δʼ ἐπαιτιώμενος ὁ δεσπότης κοινῇ τοῦ βλάψαντος τέχνῃ καὶ τοῦ βλαβέντος ἐπʼ ἀποστερήσει φῇ τοῦ δούλου γεγονέναι τὴν αἰτίαν, διαδικαζέσθω μὲν κακοτεχνιῶν τῷ φάσκοντι βλαβῆναι, καὶ ἐὰν ἕλῃ, διπλασίαν τῆς ἀξίας

when the injured man himself has had no share in causing the injury through his own clumsy or careless handling, then the master of him that has done the injury shall fully make good the damage, or else shall hand over the person of the injurer: but if the master brings a charge affirming that the claim is made in order to rob him of his slave by a privy agreement between the injurer and the injured party, then he shall prosecute the man who claims that he has been injured on the charge of conspiracy; and if he wins his case, he shall receive double the price at which the court shall assess the slave,