Deuteronomy 10:16 in the King James Version
Circumcise therefore the foreskin of your heart, and be no more stiffnecked.
Context
15 Only the LORD had a delight in your fathers to love them, and he chose their offspring after them, even you above all peoples, as it is today.
16 Circumcise therefore the foreskin of your heart, and be no more stiff-necked.
17 For the LORD your God, he is God of gods and Lord of lords, the great God, the mighty, and the awesome, who doesn’t respect persons or take bribes.