The meaning of Witness in the Bible
(From Easton's Bible Dictionary)

More than one witness was required in criminal cases (Deuteronomy 17:6; 19:15). They were the first to execute the sentence on the condemned (Deuteronomy 13:9; 17:7; I Kings 21:13; Matthew 27:1; Acts 7:57,58). False witnesses were liable to punishment (Deuteronomy 19:16-21). It was also an offence to refuse to bear witness (Leviticus 5:1).

See more on the meaning of Witness in the Bible:
Witness {International Standard Bible Encyclopedia}

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