Dictionary entry

διαφυλάσσω

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

δια-φυλάσσω

[in LXX chiefly for שׁמר (as Ps 90 (91):11);]

to guard carefully (M, Pr., 116), defend: c. acc, Lk 4:10^(LXX).†