Nevertheless, they did flatter him with their mouth As if they thought, by mere fair speeches, to prevail on Him who searches the heart, and requires truth in the inward parts, to revoke the sentence gone out against them, or remove the judgment under which they suffered. And they lied unto him with their tongue They made glorious but false professions and protestations of their sincere resolutions of future obedience. For their heart was not right with him All their confessions and petitions were but hypocritical and forced, and did not proceed from hearts truly upright and grieved for their former offences, and firmly resolved to turn unto the Lord. Neither were they steadfast in his covenant They discovered their hypocrisy, by their apostacy from God, as soon as their danger was past.
Related Commentaries of Psalms 78:36
Psalms 78:36-37
36 Nevertheless they did flatter him with their mouth, and they lied unto him with their tongues.
37 For their heart was not right with him, neither were they stedfast in his covenant.