Plato, Laws 872b

τε αὖ πρὸς δούλους, τῆς τε αὐτοχειρίας πέρι καὶ ἐπιβουλεύσεως, πλὴν τῆς ἐγγύης· ταύτην δέ, καθάπερ εἴρηται, τοὺς αὐτόχειρας κατεγγυᾶσθαι, τὸν δὲ προαγορεύοντα τὸν φόνον ἅμα κατεγγυᾶν καὶ τούτους. ἐὰν δὲ δοῦλος ἐλεύθερον ἑκών, εἴτε αὐτόχειρ εἴτε βουλεύσας, ἀποκτείνῃ καὶ ὄφλῃ τὴν δίκην, ὁ τῆς πόλεως κοινὸς δήμιος ἄγων πρὸς τὸ μνῆμα τοῦ ἀποθανόντος, ὅθεν ἂν ὁρᾷ τὸν τύμβον, μαστιγώσας ὁπόσας

or slaves with slaves, in respect both of actual murder and of plotting to murder, except as regards bail; and as to this, just as it has been said that the actual murderers must be secured by guarantors, so these persons too must provide security to the person who proclaims the murder. If a slave willfully slay a free man, either by his own hand or by plotting, and be convicted at the trial, the public executioner of the State shall drag him in the direction of the tomb of the dead man to a spot from which he can see the tomb, and there scourge him with as many stripes