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A witness is whoever, or whatever, can vouch that something is so. In the Bible the word covers a wide field that all shares this one job. Most often it is a person in a legal setting, the one who saw the crime, sealed the deal, or stands up in court to tell what they know. The law leans hard on these people: a charge needs more than one of them, and a person who lies on the stand is treated as a serious offender, because the whole system of justice rests on their truthfulness.

The same word reaches past the courtroom in two natural directions. First, an object can be a witness. When people make a binding agreement they often set up something lasting, a heap of stones, a pillar, an altar, a written song, so that it stands there as a silent reminder of what was promised. The thing itself testifies, simply by enduring where everyone can see it.

Second, God is the supreme witness. He sees what no human saw, the private oath, the hidden sin, the secret intent, so people call on him to witness their agreements and the prophets warn that he will witness against wrongdoers in person. Out of this grows a striking idea in Isaiah, where God puts his own people on the stand as his witnesses, the ones who can testify before the nations that he alone is God because they have seen him act.

All of these are the same word doing the same work: standing up for what is true. The difference is only who or what does the standing, a neighbor, a stone, or God himself.