They would not be like their ancestors – a stubborn and rebellious generation, whose hearts were not loyal to God, whose spirits were not faithful to him.
NIV
And might not be as their fathers--a stubborn and rebellious generation, a generation that set not their hearts aright nor prepared their hearts to know God, and whose spirits were not steadfast and faithful to God.
AMP
And might not be as their fathers, a stubborn and rebellious generation; a generation that set not their heart aright, and whose spirit was not stedfast with God.
KJV