Plato, Laws 763d

ἵνα κατὰ νόμους γίγνωνται πᾶσαι, καὶ δὴ καὶ τῶν ὑδάτων, ὁπόσʼ ἂν αὐτοῖς πέμπωσι καὶ παραδιδῶσιν οἱ φρουροῦντες τεθεραπευμένα, ὅπως εἰς τὰς κρήνας ἱκανὰ καὶ καθαρὰ πορευόμενα, κοσμῇ τε ἅμα καὶ ὠφελῇ τὴν πόλιν. δεῖ δὴ καὶ τούτους δυνατούς τε εἶναι καὶ σχολάζοντας τῶν κοινῶν ἐπιμελεῖσθαι· διὸ προβαλλέσθω μὲν πᾶς ἀνὴρ ἐκ τῶν μεγίστων τιμημάτων ἀστυνόμον ὃν ἂν βούληται, διαχειροτονηθέντων

to see that all these conform to the requirements of the law; and they shall also have charge of all the water-supplies conveyed and passed on to them by the guards in good condition, to ensure that they shall be both pure and plentiful as they pour into the cisterns, and may thus both beautify and benefit the city. Thus it is needful that these men also should have both the ability and the leisure to attend to public affairs. Therefore for the office of city-steward every citizen shall nominate whatever person he chooses from the highest property-class; and when these have been voted on, and they have arrived at the six men