βιβλιοφυλάκιον
From LSJ
μὴ ἐν πολλοῖς ὀλίγα λέγε, ἀλλ΄ ἐν ὀλίγοις πολλά → don't say little in many words, but much in a few words (Stobaeus quoting Pythagoras)
English (LSJ)
[ᾰ], τό,
A place to keep books in, τὰ βασιλικὰ β. the royal archives, LXX 1 Es.6.21, 23, PTeb.318.23 (ii A. D.).
German (Pape)
[Seite 444] τό, ein Ort zum Aufbewahren von Schriften, Archiv, LXX.