διατηρητέον
From LSJ
τούτων γάρ ἑκάτερον κοινῷ ὀνόματι προσαγορεύεται ζῷον, καί ὁ λόγος δέ τῆς οὐσίας ὁ αὐτός → and these are univocally so named, inasmuch as not only the name, but also the definition, is the same in both cases (Aristotle, Categoriae 1a8-10)
English (LSJ)
A one must preserve, Gp. 9.11.10; one must keep, ἐν ἀγρυπνίᾳ Aët.13.12.
Spanish (DGE)
hay que proteger o preservar τὸ φλοιόν Gp.9.11.10
•hay que observar los mandamientos, Clem.Al.Paed.2.10.89
•c. compl. dir. y pred. hay que vigilar, hay que tener cuidado de que δ. δὲ καὶ ἐν ἀγρυπνίᾳ τὸν πάσχοντα ἀνακαθήμενον Aët.13.12.