Psalms 78:37 KJV
For their heart was not right with him, neither were they stedfast in his covenant.
Psalms 78:37, King James Version
In context
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.
38 But he, being full of compassion, forgave their iniquity, and destroyed them not: yea, many a time turned he his anger away, and did not stir up all his wrath.