Plato, Laws 923c

ὑμετέρων μελήσει, κηδομένοις ὅτι μάλιστα εἰς δύναμιν, οὐ τῶν μέν, τῶν δὲ οὔ. ταῦτα μὲν οὖν παραμύθιά τε καὶ προοίμια τῶν τε ζώντων, ὦ Κλεινία, καὶ τῶν τελευτώντων ἔστω, νόμος δὲ ὅδε· ὃς ἂν διαθήκην γράφῃ τὰ αὑτοῦ διατιθέμενος, παίδων ὢν πατήρ, πρῶτον μὲν τῶν ὑέων κληρονόμον ὃν ἂν ἀξιώσῃ γίγνεσθαι γραφέτω, τῶν δὲ ἄλλων παίδων, ὃν ἂν μὲν ἑτέρῳ ποιεῖσθαι διδῷ δεχομένῳ, γραφέσθω τοῦτο αὐτό·

shall be our care, and we will watch over them all, without exception, to the best of our power. This shall serve, Clinias, alike for consolation and for prelude for both the living and the dying, and the law shall run as follows:— Whosoever writes a will disposing of his property, if he be the father of children, he shall first write down the name of whichever of his sons he deems worthy to be his heir, and if he offers any one of his other children to another man to be adopted by him, this also he shall write down; and if he has any son besides that is not adopted for any lot,