Plato, Laws 872c

ἂν ὁ ἑλὼν προστάττῃ, ἐάνπερ βιῷ παιόμενος ὁ φονεύς, θανατωσάτω. ἐὰν δέ τις δοῦλον κτείνῃ μηδὲν ἀδικοῦντα, φόβῳ δὲ μὴ μηνυτὴς αἰσχρῶν ἔργων καὶ κακῶν αὐτοῦ γίγνηται, ἤ τινος ἕνεκα ἄλλου τοιούτου, καθάπερ ἂν εἰ πολίτην κτείνας ὑπεῖχε φόνου δίκας, ὡσαύτως καὶ τοῦ τοιούτου δούλου κατὰ τὰ αὐτὰ ἀποθανόντος οὕτως ὑπεχέτω.ἐὰν δὲ δὴ γίγνηται ἐφʼ οἷσι καὶ νομοθετεῖν δεινὸν καὶ οὐδαμῶς προσφιλές, μὴ νομοθετεῖν δὲ ἀδύνατον, συγγενῶν

as the prosecutor shall prescribe; and if the murderer be still alive after the beating, he shall put him to death. And if a man kill a slave when he is doing no wrong, actuated by fear lest the slave should expose his own foul and evil deeds, or for any other such reason, just as he would have been liable to a charge of murder for slaying a citizen, so likewise he shall be liable in the same way for the death of such a slave. Should cases occur of a kind for which it is a formidable and most unwelcome task to legislate, and yet impossible not to legislate,—such as murders of kinsfolk, either by a man’s own hand