Plato, Laws 881c

ὁ δὲ μὴ μέτοικος βοηθῶν μὲν ἔπαινον ἐχέτω, μὴ βοηθῶν δέ, ψόγον· δοῦλος δὲ βοηθήσας μὲν ἐλεύθερος γιγνέσθω, μὴ βοηθήσας δὲ πληγὰς ἑκατὸν τῇ μάστιγι τυπτέσθω, ἐν ἀγορᾷ μὲν ἂν γίγνηται τὸ γενόμενον, ὑπʼ ἀγορανόμων, ἐὰν δʼ ἐκτὸς ἀγορᾶς ἐν ἄστει, τῶν ἀστυνόμων κολάζειν τὸν ἐπιδημοῦντα, ἐὰν δὲ κατʼ ἀγροὺς τῆς χώρας που, τοὺς τῶν ἀγρονόμων ἄρχοντας. ἐὰν δʼ ἐπιχώριος ὁ παρατυγχάνων ᾖ τις, ἐάντε

and the non-resident Stranger shall receive praise if he helps, and blame if he does not help; and the slave who helps shall be made free, but if he fails to help he shall be beaten with 100 stripes of a scourge by the market-stewards, if the assault occur in the market, and if it occur in the city, but outside the market-place, the punishment shall be inflicted by the city-steward in residence, and if it occur in any country district, by the officers of the country-stewards. And the bystander who is a native—whether man, woman, or boy—shall in every case drive off the attacker, crying out against his impiety;