False witness is a form of lying, particularly in the judicial sense where one is trying to bring down fellow believer.
Many see the belief in Yah as a competition to see who is the ‘best’ in the assembly, and they will lie and cheat in order to keep up appearances. When we do this, when we create malicious gossip about each other, we forget that Yah can read our motivation easily since He can see the scars and tears it makes upon our spiritual robes.
Lying is necessary in some situations, and we must learn to discern those situations with help from the scriptures, and there appears to be such a thing as a righteous lie, usually in dire circumstances.
But Yah does not lie, His Creation is truth and for Yah to lie means that Creation, and the Torah with which He spoke Creation into existence are not the Truth that we as truth seekers are looking for. In this context, false witness can be denying Yah’s Torah and teaching men’s fairy tales instead of Yah’s Truths. We are allowed to get things wrong, we are starting from scratch trying to throw off the pre-conceived idea that is religion, and to substitute the truths that are the reality of Yah’s Creation and to live those truths. This is not easy, it is much easier to live the lie (false witness) put about by religionists and become part of the acceptable community, once shown the truth we must make a judgement, live that truth, or live the lie. We live a Torah compliant life to the best of our knowledge and ability or we live the false witness of those Rabbis and Pastors in whom we invest our very salvation.