Matthew 18:16μαρτύρων
But if he will not listen, take one or two others along, so that ‘every matter may be established by the testimony of two or three witnesses.’
Luke 11:48μάρτυρές
So you are witnesses consenting to the deeds of your fathers: They killed the prophets, and you build their tombs.
Acts 1:8μάρτυρες
But you will receive power when the Holy Spirit comes upon you, and you will be My witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth.”
2 Corinthians 13:1μαρτύρων
This is the third time I am coming to you. “Every matter must be established by the testimony of two or three witnesses.”
1 Thessalonians 2:10μάρτυρες
You are witnesses, and so is God, of how holy, righteous, and blameless our conduct was among you who believed.
Revelation 1:5μάρτυς
and from Jesus Christ, the faithful witness, the firstborn from the dead, and the ruler of the kings of the earth. To Him who loves us and has released us from our sins by His blood,

Abbott-Smith

μάρτυς
(Æolic μάρτυρ), -υρος, ὁ (also ἡ), [in LXX for עֵד ;]
a witness: Act.10:41, 1Ti.6:12, 2Ti.2:2, Heb.12:1 (Westc., in l); in forensic sense, Mat.18:16 26:65, Mrk.14:63, Act.6:13 7:58, 2Co.13:1, 1Ti.5:19, Heb.10:28; with genitive obj., Luk.24:48, Act.1:22 2:32 3:15 5:32 10:39 26:16, 1Pe.5:1; with genitive poss., Act.1:8 13:31, Rev.11:3; with dative of person(s), Luk.11:48, Act.22:15; of Christ, Rev.1:5 3:14; of God, Rom.1:9, 2Co.1:23, Php.1:8, 1Th.2:5 2:10; of those who have witnessed for Christ by their death (in later Xn. lit., martyr: Swete, Ap., 35), Act.22:20, Rev.2:13 17:6.†
(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.