τηρέω, -ῶ
[in LXX for שָׁמַר, נָצַר, etc. ;]
__1. to watch over, guard, keep, preserve: Mat.27:36, Act.16:23, al.; ἑαυτόν, 2Co.11:9, 1Ti.5:22, Jas.1:27, Ju 21; before εἰς, Jhn.12:7, Act.25:21, 1Pe.1:4, 2Pe.2:4 2:9 3:7, Ju 6; ἐν, Jhn.17:11-12, Ju 21; ἐκ, Jhn.17:15, Rev.3:10; τ. πίστιν, 2Ti.4:7, Rev.14:12; τ. ἑνότητα τ. πνεύματος, Eph.4:3.
__2. to watch, give heed to, observe: τ. σάββατον, Jhn.9:16; τ. ἐντολήν (-άς), Mat.19:17, Jhn.14:15 15:10, 1Ti.6:14, 1Jn.2:3-4 Jn 3:22 Jn 3:24 Jn 5:3, Rev.12:17 14:12; τ. λόγον (-ους), Jhn.8:51-52, 55 14:23-24 15:20 17:6, 1Jn.2:5, Rev.3:8, 10 22:7, 9; τ. νόμον, Act.15:5, Jas.2:10; τ. παράδοσιν, Mrk.7:9; τ. ἔργα, Rev.2:26; τ. γεγραμμένα, Rev.1:3 (cf. δια-, παρα-, συν-τηρέω)
SYN.: φυλάσσω, implying custody and protection: τ. expresses the idea of watchful care and "may mark the result of which φ. is the means" (Thayer see word) (AS)