Matthew 19:17τήρησον
“Why do you ask Me about what is good?” Jesus replied. “There is only One who is good. If you want to enter life, keep the commandments.”
John 14:21τηρῶν
Whoever has My commandments and keeps them is the one who loves Me. The one who loves Me will be loved by My Father, and I will love him and reveal Myself to him.”
Acts 15:5τηρεῖν
But some believers from the party of the Pharisees stood up and declared, “The Gentiles must be circumcised and required to obey the law of Moses.”
1 John 2:4τηρῶν
If anyone says, “I know Him,” but does not keep His commandments, he is a liar, and the truth is not in him.
Jude 1:21τηρήσατε
keep yourselves in the love of God as you await the mercy of our Lord Jesus Christ to bring you eternal life.
Revelation 1:3τηροῦντες
Blessed is the one who reads aloud the words of this prophecy, and blessed are those who hear and obey what is written in it, because the time is near.

Abbott-Smith

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)

Sources: Abbott-Smith’s Manual Greek Lexicon of the New Testament (1922, public domain) and glosses from STEPBible TBESG (CC BY 4.0); STEPBible TAGNT (Greek New Testament, CC BY 4.0); the Berean Standard Bible (public domain). Reformatted by Word Study, wording unchanged. All sources and licenses.