Proverbs 20:27 in the King James Version
The spirit of man is the candle of the LORD, searching all the inward parts of the belly.
Context
26 A wise king winnows out the wicked, and drives the threshing wheel over them.
27 The spirit of man is the LORD’s lamp, searching all his innermost parts.
28 Love and faithfulness keep the king safe. His throne is sustained by love.