Plato, Laws 868a

ἀρχόντων ἐμμένειν. ἐὰν δʼ αὖθίς ποτε κατελθὼν ὁπότερος αὐτοῖν ἡττηθεὶς ὀργῇ πράξῃ ταὐτὸν τοῦτο, φυγὼν μηκέτι κατέλθῃ, κατελθὼν δέ, κατὰ τὴν τοῦ ξένου ἄφιξιν ταύτῃ πασχέτω. δοῦλον δʼ ὁ κτείνας ἑαυτοῦ μὲν καθηράσθω, ἐὰν δὲ ἀλλότριον θυμῷ, διπλῇ τὸ βλάβος ἐκτεισάτω τῷ κεκτημένῳ. ὅστις δʼ ἂν τῶν ἀποκτεινάντων πάντων μὴ πείθηται τῷ νόμῳ, ἀλλʼ ἀκάθαρτος ὢν ἀγοράν τε καὶ ἆθλα καὶ τὰ

And if either of them, after his return, again yields to rage and commits the same act, he shall be exiled, and never again return; and if he returns, he shall suffer the same fate as the returned Stranger. He that slays a slave of his own shall purify himself; and if he kill another man’s slave in rage, he shall pay to the owner twice the damage. And if anyone of all these types of slayers disobeys the law and, being unpurified, defiles the market and the games and other sacred assemblies, whoso pleases shall prosecute