John 3:28μαρτυρεῖτε
You yourselves can testify that I said, ‘I am not the Christ, but am sent ahead of Him.’
Acts 10:43μαρτυροῦσιν
All the prophets testify about Him that everyone who believes in Him receives forgiveness of sins through His name.”
Hebrews 7:8μαρτυρούμενος
In the case of the Levites, mortal men collect the tenth; but in the case of Melchizedek, it is affirmed that he lives on.
1 John 1:2μαρτυροῦμεν
And this is the life that was revealed; we have seen it and testified to it, and we proclaim to you the eternal life that was with the Father and was revealed to us.
3 John 1:6ἐμαρτύρησάν
They have testified to the church about your love. You will do well to send them on their way in a manner worthy of God.
Revelation 1:2ἐμαρτύρησεν
who testifies to everything he saw. This is the word of God and the testimony of Jesus Christ.

Abbott-Smith

μαρτυρέω, -ῶ
(μάρτυς), [in LXX chiefly for עֵד (עֵד (Gen.31:47-48, al.), also for עוּד hi. (Gen.43:3, La 2:13), עָנָה (Num.35:30) ;]

(a) prop., to be a witness, bear witness, testify: absol. (find., al.), Jhn.15:27, Act.26:5; parenthetical (Bl., § 79, 7; MM, xvi), 2Co.8:3; with dative of person(s) (comm. and incomm.; El., § 37, 2), Act.22:5, Heb.10:15; id. before ὅτι, Mat.23:31, Rom.10:2, al.; accusative and inf., Act.10:43; with accusative of thing(s) (cl.), Jhn.3:11, Rev.22:16, 20; with accusative cogn., before περί, Jhn.5:32, 1Jn.5:10; with dative of thing(s), Jhn.5:33, Act.14:3, al.; before περί, with genitive (of person(s) and of thing(s)), Jhn.1:7-8, 15 2:25 18:23 21:24, al.; id. before ὅτι, Jhn.5:36 7:7; ὅτι, Jhn.1:34 4:44 al.; ὅτι recit., Jhn.4:39; κατά before ὅτι, 1Co.15:15; pass., Heb.7:8; ptcp., Rom.3:21; impers., Heb.7:17;

(b) in late Gk., to witness favourably, give a good report, approve (Bl., § 54, 3; MM, xvi; Deiss., BS, 265): with dative of person(s), Luk.4:22; before ἐπί with dative of thing(s), Heb.11:4; pass., Act.6:3; before ἐν, 1Ti.5:10, Heb.11:2; διά, with genitive of thing(s),

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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.