Proverbs 17:7
"Excellent speech becometh not a fool: much less do lying lips a prince."
Cross References (ranked by relevance)
If a ruler hearken to lies, all his servants are wicked.
Yea, surely God will not do wickedly, neither will the Almighty pervert judgment.
The God of Israel said, the Rock of Israel spake to me, He that ruleth over men must be just, ruling in the fear of God.
The lip of truth shall be established for ever: but a lying tongue is but for a moment.
Thou hypocrite, first cast out the beam out of thine own eye; and then shalt thou see clearly to cast out the mote out of thy brother’s eye.
The legs of the lame are not equal: so is a parable in the mouth of fools.