'Sincerity' in the Bible

He who walks righteously and speaks with sincerity,He who rejects unjust gainAnd shakes his hands so that they hold no bribe;He who stops his ears from hearing about bloodshedAnd shuts his eyes from looking upon evil;

“Hear this, O house of Jacob, you who are called by the name of IsraelAnd who come from the seed of Judah,You who swear [allegiance] by the name of the LordAnd invoke the God of Israel,But not in truth (sincerity) nor in righteousness [with moral and spiritual integrity].