Matthew 18:15ἔλεγξον
If your brother sins against you, go and confront him privately. If he listens to you, you have won your brother over.
Luke 3:19ἐλεγχόμενος
But when he rebuked Herod the tetrarch regarding his brother’s wife Herodias and all the evils he had done,
John 3:20ἐλεγχθῇ
Everyone who does evil hates the Light, and does not come into the Light for fear that his deeds will be exposed.
1 Corinthians 14:24ἐλέγχεται
But if an unbeliever or uninstructed person comes in while everyone is prophesying, he will be convicted and called to account by all,
Ephesians 5:11ἐλέγχετε
Have no fellowship with the fruitless deeds of darkness, but rather expose them.
Titus 1:9ἐλέγχειν¶
He must hold firmly to the faithful word as it was taught, so that he can encourage others by sound teaching and refute those who contradict it.

Abbott-Smith

ἐλέγχω
[in LXX chiefly for יָכַח hi. ;]

1. in Hom., to treat with contempt.

2. to convict: with accusative, Mat.18:15 (RV, show him his fault), Tit.1:9; before περί, Jhn.8:46 16:8, Ju 15; pass., Jas.2:9.

3. to reprove, rebuke: 1Ti.5:20, 2Ti.4:2, Tit.1:13 2:15, Rev.3:19; pass., before περί, Luk.3:19; ὑπό, Heb.12:5 (LXX).

4. to expose: Eph.5:11; pass., Jhn.3:20, 1Co.14:24 (RV reprove, mg. convict), Eph.5:13 (RV, as 1 Co, l.with, of. AR on Eph.5:11; MM, Exp., xii; cf. ἐξ-, δια-κατ-ελέγχομαι).†
SYN.: ἐπιτιμῶ, expressing simply rebuke, which may be undeserved (Mat.16:22) or ineffectual (Luk.23:40), while ἐλ. implies rebuke which brings conviction (see Tr., Syn., § iv)
(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.