Proverbs 20:28 KJV
Mercy and truth preserve the king: and his throne is upholden by mercy.
Proverbs 20:28, King James Version
In context
27 The spirit of man is the candle of the Lord, searching all the inward parts of the belly.
28 Mercy and truth preserve the king: and his throne is upholden by mercy.
29 The glory of young men is their strength: and the beauty of old men is the gray head.