During biblical times a juror would be given a black stone and a white stone. After hearing the testimony a pouch would be passed around where a black stone would be given for a guilty verdict or a white stone for not guilty.
Jesus gives us each a white stone.

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“To the one who is victorious, I will give some of the hidden manna.
I will also give that person a white stone with a new name written on it,
known only to the once who receives it.”