Plato, Laws 771d

καὶ λόγῳ, νείμωμέν τε ταύτην, καὶ ἑκάστῃ μοίρᾳ θεὸν ἢ θεῶν παῖδα ἐπιφημίσαντες, βωμούς τε καὶ τὰ τούτοις προσήκοντα ἀποδόντες, θυσιῶν πέρι συνόδους ἐπʼ αὐτοῖς ποιώμεθα δύο τοῦ μηνός, δώδεκα μὲν τῇ τῆς φυλῆς διανομῇ, δώδεκα δὲ αὐτῷ τῷ τῆς πόλεως διαμερισμῷ, θεῶν μὲν δὴ πρῶτον χάριτος ἕνεκα καὶ τῶν περὶ θεούς, δεύτερον δὲ ἡμῶν αὐτῶν οἰκειότητός τε πέρι καὶ γνωρίσεως ἀλλήλων, ὡς φαῖμεν ἄν, καὶ

and we shall employ these subdivisions, and give to each portion the name of a God, or of a child of Gods, and bestow on it altars and all that belongs thereto; and at these we shall appoint two assemblies every month for sacrifice—of which twelve (yearly) shall be for the whole tribal division, and twelve for its urban section only; the object of these shall be, first, to offer thanksgiving to the gods and their attendants, and secondly, to promote fellowship amongst ourselves and the mutual acquaintance we spoke of, and association of every sort.