A martus is someone who can say what happened, under oath if needed — dying for it came later, not first.
In everyday Greek, a martus is a witness in the ordinary legal sense: someone called into a dispute or a trial because they saw or heard the thing in question. Two or three witnesses could establish a fact in Jewish law, and the word carries that courtroom weight — it means testimony that can be checked, not just an opinion offered. Paul uses it this way when he calls God as his witness, or when Hebrews pictures a stadium full of them.
The word shifts, though, without ever leaving that legal sense behind. Because testifying to Jesus got people killed, martus starts to carry the shadow of death alongside the act of speaking. Stephen is called Christ's martus right as he's being stoned. By the time Revelation is written, the word already leans toward what we'd call a martyr, though it never fully sheds its courtroom origin — you're still someone giving testimony, it's just that the testimony has cost you your life.
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.”
Jesus sends the apostles as witnesses in the plain, evidentiary sense — people who saw and can say so.
And when the blood of Your witness Stephen was shed, I stood there giving my approval and watching over the garments of those who killed him.’
Paul calls Stephen 'your martus' right as he recalls Stephen being stoned, catching the word mid-shift.
Therefore, since we are surrounded by such a great cloud of witnesses, let us throw off every encumbrance and the sin that so easily entangles, and let us run with endurance the race set out for us.
The 'cloud of witnesses' are testifiers whose lives argue for faith, not necessarily people who were executed.
I know where you live, where the throne of Satan sits, yet you hold fast to My name. You did not deny your faith in Me, even in the days of My faithful witness Antipas, who was killed among you where Satan dwells.
Antipas is called God's faithful martus after being killed, showing how far the word has moved by this point.
English translators split martus down the middle. Where the legal, eyewitness sense is clear, they reach for 'witness' — Acts 1:8, Hebrews 12:1. Where death is plainly in view, they switch to 'martyr' — Acts 22:20, Revelation 2:13, 17:6. That split is defensible, but it hides the fact that Greek readers met one word doing both jobs, and had to work out from context how far along the spectrum it sat.
The common mistake is assuming martus always meant a religious death, so that every 'witness' in the New Testament is quietly imagined as a future martyr. It didn't start that way. The word is ordinary courtroom vocabulary — someone testifying to facts — and only gathers its darker meaning as the history of persecution catches up with it, sometime around Stephen's death and after.
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