📖 Biblical Definition
A witness in Scripture is one who testifies to what He has seen, heard, and known. The law required two or three witnesses to establish any matter (Deut 19:15); false witness was a capital crime (Deut 19:18-19). Jesus used this Mosaic principle repeatedly (Matt 18:16, 2 Cor 13:1, 1 Tim 5:19). In the Gospels Jesus commissions the apostles as eyewitnesses of His resurrection: "You will be my witnesses in Jerusalem and in all Judea and Samaria, and to the end of the earth" (Acts 1:8). The Christian life is witness: we testify to what Christ has done — first in the apostles' historical sense (they saw Him risen) and now in the derivative sense (He saved us, changed us, sustains us). Because witnesses so often were killed for their testimony, martys shifted in meaning: a martyr is a witness whose testimony was validated in his own blood. Every Christian is a witness; some are martyr-witnesses. All must be truthful witnesses.
📜 Webster 1828 Definition
WIT'NESS, n.
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WIT'NESS, n. [Sax. witnes.] (1.) Testimony; attestation of a fact or event. (2.) That which furnishes evidence or proof. (3.) A person who knows or sees any thing, to which he may give testimony. In Scripture, every Christian is called to be a witness unto Christ, testifying of what he has seen and heard, of the truth of the gospel, of the change wrought in his own soul. The apostles were specifically witnesses of the resurrection; and in the persecutions of the early church, so many witnesses died for their testimony, that the Greek word martys, "witness," has passed into English as martyr.
📖 Key Scripture
Acts 1:8 — "But you will receive power when the Holy Spirit has come upon you, and you will be my witnesses in Jerusalem and in all Judea and Samaria, and to the end of the earth."
John 15:26-27 — "When the Helper comes... he will bear witness about me. And you also will bear witness, because you have been with me from the beginning."
Revelation 12:11 — "They have conquered Him by the blood of the Lamb and by the word of their testimony, for they loved not their lives even unto death."
Deuteronomy 19:15 — "A single witness shall not suffice against a person for any crime or for any wrong in connection with any offense that he has committed. Only on the evidence of two witnesses or of three witnesses shall a charge be established."
⚠️ Modern Corruption
Modern Christianity has largely traded witness for PR and branding; biblical witness is personal, costly, and unscripted.
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A witness speaks from experience. He was there. He saw. He testifies. The biblical witness is not a professional advertiser of a product line; he is a person who encountered Christ and cannot help speaking what he has seen and heard (Acts 4:20). Modern evangelical culture often substitutes branding and marketing for witness: slick, professional, risk-free. True witness is always personal, always costly, always exposing the witness to whatever the audience does with the truth. Many of your fellow Christians around the world are currently in prison or under threat of death for their witness. The West's comfortable Christianity often cannot even withstand social awkwardness. Recover the martyr-etymology of the word: a witness is one whose testimony is so real he will pay for it. Every Christian is called to that posture, even if not to that price.
🔗 Greek & Hebrew Roots
H5707 — ed (עֵד) — witness; G3144 martys.
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H5707 — ed (עֵד) — witness; legal and covenantal.
G3144 — martys (μάρτυς) — witness; the word that became "martyr."
G3141 — martyria (μαρτυρία) — testimony, witness borne.
Usage
"Every witness is a martyr-in-waiting. The Greek word did not distinguish between speaking and dying; the early church often could not either."
"You cannot help speaking of what you have seen and heard. If you can easily stop, you probably did not see what you thought you did."