Night by Elie Wiesel contains a consistent theme of "witnesses" who serve as warnings for the Jews, though they do not listen. One reading of the word "witness" is a person who actually observes an event. That would include someone like Moshe the Beadle who was in a Hungarian concentration camp and tries to warn everyone of the impending dangers (though no one listened), or the old inmate in chapter three who warns Elie and his father to lie about their ages because he has seen what happens to others in their circumstances.
There is another possible component of the word, however, which applies to this novel and particularly to chapter two.
A witness is someone who has, who claims to have, or is thought, by someone with authority to compel testimony, to have knowledge relevant to an event or other matter of interest.
In the case of Night , chapter two is full of the testimony of one such...
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