לֹֽא־יָקוּם֩ עֵ֨ד אֶחָ֜ד בְּאִ֗ישׁ לְכָל־עָוֺן֙ וּלְכָל־חַטָּ֔את בְּכָל־חֵ֖טְא אֲשֶׁ֣ר יֶֽחֱטָ֑א עַל־פִּ֣י ׀ שְׁנֵ֣י עֵדִ֗ים א֛וֹ עַל־פִּ֥י שְׁלֹשָֽׁה־עֵדִ֖ים יָק֥וּם דָּבָֽר׃
One witness shall not rise up against a man for any iniquity, or for any sin, in any sin that he sinneth; at the mouth of two witnesses, or at the mouth of three witnesses, shall a matter be establishment
The Five Books of Moses, by Everett Fox
The need for multiple witnesses and proper inquiry establishes the seriousness of what is at stake in the justice system. In keeping with the biblical idea of “equity” (Heb. tzedek), that is, fairness and balance in judgment, a false witness suffers the same punishment as would have befallen the innocent person whom he accused. The “eye for an eye” punishment is thus to serve as a deterrent for a most abhorrent crime.