Plato, Laws 947b

ἐνιαυτῷ τῶν ἱερέων, καὶ τοὔνομα ἀναγράφειν τούτου κατʼ ἐνιαυτόν, ὅπως ἂν γίγνηται μέτρον ἀριθμοῦ τοῦ χρόνου, ἕως ἂν ἡ πόλις οἰκῆται. τελευτήσασι δὲ προθέσεις καὶ ἐκφορὰς καὶ θήκας διαφόρους εἶναι τῶν ἄλλων πολιτῶν· λευκὴν μὲν τὴν στολὴν ἔχειν πᾶσαν, θρήνων δὲ καὶ ὀδυρμῶν χωρὶς γίγνεσθαι, κορῶν δὲ χορὸν πεντεκαίδεκα καὶ ἀρρένων ἕτερον περιισταμένους τῇ κλίνῃ ἑκατέρους οἷον ὕμνον πεποιημένον

that it may serve as a measure of the date, so long as the State remains. When they die, their laying-out, funeral and interment shall be different from that of other citizens: nothing but white raiment shall be used at it, and there shall be no dirges or lamentations; a choir of girls and another of boys shall stand round the bier, and they shall chant alternately a laudation for the priests in the form of a hymn in verse, glorifying them with their hymnody all the day long;