Plato, Laws 869d

ἀμυνόμενος ἄρχοντα χειρῶν πρότερον, καθάπερ πολέμιον ἀποκτείνας ἔστω καθαρός, καὶ ἐὰν πολίτης πολίτην, ὡσαύτως, ἢ ξένος ξένον. ἐὰν δὲ ἀστὸς ξένον ἢ ξένος ἀστὸν ἀμυνόμενος κτείνῃ, κατὰ ταὐτὰ ἔστω τοῦ καθαρὸς εἶναι. καὶ ἐὰν δοῦλος δοῦλον, ὡσαύτως· ἐὰν δὲ αὖ δοῦλος ἐλεύθερον ἀμυνόμενος ἀποκτείνῃ, καθάπερ ὁ κτείνας πατέρα, τοῖς αὐτοῖς ἔνοχος ἔστω νόμοις. ὃ δὲ περὶ τῆς ἀφέσεως εἴρηται φόνου πατρί, ταὐτὸν τοῦτο ἔστω περὶ ἁπάσης τῶν

against the other, who first started the brawl, he shall be counted as one who has slain an enemy, and be held guiltless; so too, when a citizen has killed a citizen in like manner, or a Stranger a Stranger. And if a citizen kill a Stranger in self-defence, or a Stranger a citizen, he shall be accounted pure in the same way. So likewise, if a slave kill a slave; but if a slave kill a free man in self-defence, he shall be liable to the same laws as he that kills a father. And what has been said about remission of the charge in the case of the murder of a father shall hold equally good