'Sincerity' in the Bible

Yet in spite of all this her treacherous sister Judah did not return to Me with her whole heart, but rather in [blatant] deception [she merely pretended obedience to King Josiah’s reforms],” declares the Lord.

“Roam back and forth through the streets of Jerusalem,And look now and take note.And look in her open squaresTo see if you can find a man [as Abraham sought in Sodom],One who is just, who [has integrity and moral courage and] seeks truth (faithfulness);Then I will pardon Jerusalem—[for the sake of one uncompromisingly righteous person].