Plato, Laws 863a

δὴ τῶν τοιούτων πέρι νομοθέτῃ κολαστὴν τῶν ἁμαρτημάτων θάνατον ἀνάγκη νέμειν, ἄλλως δὲ οὐδαμῶς. ἔοικε μέν πως λέγεσθαι τὰ παρὰ σοῦ καὶ μάλα μετρίως, ἥδιον δʼ ἂν ἔτι σαφέστερον ἀκούσαιμεν ταῦτα ῥηθέντα, τὸ τῆς ἀδικίας τε καὶ βλάβης διάφορον καὶ τὸ τῶν ἑκουσίων καὶ ἀκουσίων ὡς ἐν τούτοις διαπεποίκιλται. πειρατέον τοίνυν ὡς κελεύετε δρᾶν, καὶ λέγειν.

the State of wicked men,—and thus he will of necessity inflict death as the chastisement for their sins, in cases of this kind, and of this kind only. What you have said seems very reasonable; but we should be glad to hear a still clearer statement respecting the difference between injury and injustice, and how the distinction between the voluntary and the involuntary applies in these cases. I must endeavor to do as you bid me, and explain the matter.