A false witness that speaketh lies....
If anyone can tell you first hand the destructive force a false witness has, Jesus can tell you. At his trial held in the darkness of the night according to Matthew 26:60, 2 false witnesses came before the council after many came before them speaking the truth about what Jesus had done in ministry while on earth and made a false accusation against Jesus, based on a misunderstanding of a statement Jesus made concerning the destruction of the temple (his bodily death) and rebuilding it again in 3 days. (his bodily ressurection)
"False-witness bearing" by far is one of the "greatest mischiefs" the wicked imagination can devise. It is the "one area" of wickedness against which there is least defence. Many a person have spent considerable jail time, died needless and senseless deaths, been made scapegoats to crimes they didn't commit, lost jobs, homes, status in society, investments or potential investments, and have experienced countless other tragic encounters too many to name here because they unkmnowingly became a victim of false witnessing against them. There cannot be a greater affront to God (to whom in an oath appeal is made) nor greater injury to the innocence of our neighbors (all whose interests in this world, even the dearest, lie open to an attack of this kind) than a person knowingly to give in a false testimony against them, no matter what their reasoning was.
Out of the seven things God hates in a person, the act of "lying" is involved in two of them. Not only does God hate false witnessing, you can say that he "doubly" hates it. In the 10 Commandments, (Exodus 20:16) the 9th commandment God gave the children of Israel was: "Thou shall not bear false witness against thy neighbor". What constitutes "false witnessing? According to God in Exodus 20:16, false witnessing is not limited to "false oaths" designed to deprive a man of his life or of his "constitutional rights", but "false witnessing" includes all whispering, tale-bearing, slander, and calamity; in other words, whatever lies that is deposed as truth. It's lies, told as the truth with the sole intention to cause injury to another in his goods, person, or character. "False witnessing" of any kind is against the spirit and letter of this Mosaic law. Suppressing the truth when known, by which a person may be defrauded of his property or his good name, or lie under injuries or disabilities which a discovery of the truth would have prevented, is also a crime against this law. He who bears a false testimony against or belies even the devil himself, comes under the curse of this law, because his testimony is false.
False witness is a particular manifestation of "a lying tongue" (Prov 6:17). In the King James Version of the Bible, there are "19 references" to a "false witness". According to Deuteronomy 19:16-21, If a malicious witness takes the stand to accuse a man of a crime, according to the Law, the two men involved in the dispute must stand in the presence of the Lord before the priests and the judges who are in office at the time. The judges must make a thorough investigation, and after completing their investigation, if the witness proves to be a liar by giving false testimony against the accused, then God instructed the judges and magistrates do to them as they intended to have done to the one they falsely accused. God said, It's an evil that must be purged from his people! God said when the rest of the people heard of this, they would be afraid, and never again would such an evil thing be done among them again. God was so adamant about false witnessing that he instructed the judicial system: "Show no pity: life for life, eye for eye, tooth for tooth, hand for hand, foot for foot." A false witness shall not be unpunished, and he that speaketh lies shall perish.
We are admonished by God to speak the truth in love and never to lie on one another. When a person is a faithful witness for Christ, they are in essence emulating Jesus christ, the faithful and true witness to who God is. There is an inseparable union between truth and justice. and only he who breathes and utters truth makes the righteous cause clear.