Proverbs 20:9 in the King James Version
Who can say, I have made my heart clean, I am pure from my sin?
Context
8 A king who sits on the throne of judgment scatters away all evil with his eyes.
9 Who can say, “I have made my heart pure. I am clean and without sin”?
10 Differing weights and differing measures, both of them alike are an abomination to the LORD.