Thou shalt not bear false witness against thy neighbour. 
(Exodus 20:16 -- KJV)

There are six things that the Lord hates, even seven that are disgusting to him:  ¹⁷ arrogant eyes, a lying tongue, hands that kill innocent people, ¹⁸ a mind devising wicked plans, feet that are quick to do wrong, ¹⁹ a dishonest witness spitting out lies, and a person who spreads conflict among relatives.
(Proverbs 6:16-19 -- GW)