Plato, Laws 799b

θυσίαν, τάξαι μὲν πρῶτόν τινας, ἃ δʼ ἂν ταχθῇ, Μοίραις καὶ τοῖς ἄλλοις πᾶσι θεοῖς θύσαντας κοινῇ πάντας τοὺς πολίτας, σπένδοντας καθιεροῦν ἑκάστας τὰς ᾠδὰς ἑκάστοις τῶν θεῶν καὶ τῶν ἄλλων· ἂν δὲ παρʼ αὐτά τίς τῳ θεῶν ἄλλους ὕμνους ἢ χορείας προσάγῃ, τοὺς ἱερέας τε καὶ τὰς ἱερείας μετὰ νομοφυλάκων ἐξείργοντας ὁσίως ἐξείργειν καὶ κατὰ νόμον, τὸν δὲ ἐξειργόμενον, ἂν μὴ ἑκὼν ἐξείργηται, δίκας ἀσεβείας διὰ βίου παντὸς τῷ ἐθελήσαντι παρέχειν. ὀρθῶς.

each such sacrifice is to be graced; these ordinances should be first made by certain persons, and then the whole body of citizens, after making a public sacrifice to the Fates and all the other deities, should consecrate with a libation these ordinances—dedicating each of the hymns to their respective gods and divinities. And if any man proposes other hymns or dances besides these for any god, the priests and priestesses will be acting in accordance with both religion and law when, with the help of the Law-wardens, they expel him from the feast; and if the man resists expulsion, he shall be liable, so long as he lives, to be prosecuted for impiety by anyone who chooses. That is right.