Plato, Laws 764a

ὁ δὲ μὴ ʼθέλων, ἐὰν εἰσαγγελθῇ πρὸς τοὺς ἄρχοντας, ζημιούσθω πεντήκοντα δραχμαῖς πρὸς τῷ κακὸς εἶναι δοκεῖν. ἴτω δʼ εἰς ἐκκλησίαν καὶ τὸν κοινὸν σύλλογον ὁ βουλόμενος, ἐπάναγκες δʼ ἔστω τῷ τῶν δευτέρων καὶ πρώτων τιμημάτων, δέκα δραχμαῖς ζημιουμένῳ ἐὰν μὴ παρὼν ἐξετάζηται τοῖς συλλόγοις· τρίτῳ δὲ τιμήματι καὶ τῷ τετάρτῳ μὴ ἐπάναγκες, ἀλλὰ ἀζήμιος ἀφείσθω, ἐὰν μή τι παραγγείλωσιν οἱ ἄρχοντες

if reported to the officials, shall be fined fifty drachmae, besides being declared to be a bad citizen. Whoso wishes shall attend the Ecclesia and the public assembly; and for members of the second and first property-classes attendance shall be compulsory, anyone who is found to be absent from the assemblies being fined ten drachmae; but for a member of the third or fourth class it shall not be compulsory, and he shall escape without a fine, unless the officials for some urgent reason charge everyone to attend.