Deuteronomy 10:16
Circumcise therefore the foreskin of your heart, and be no more stiffnecked.
Circumcise therefore the foreskin of your heart,.... Content not yourselves with, nor put your confidence in outward circumcision of the flesh, but be concerned for the circumcision of the heart; for removing from that whatever is disagreeable to the Lord, even all carnality, sensuality, hypocrisy, and superfluity of naughtiness, and for having that put there which is well pleasing in his sight; and which though it is the work of God, and he only can do it and has promised it, yet such an exhortation is made to bring men to a sense of their need of it, and of the importance of it, and to show how agreeable it is to the Lord, and so to stir them up to seek unto him for it; see Deuteronomy 30:6
and be no more stiffnecked; froward, obstinate, and disobedient, as they had been hitherto; Deuteronomy 9:6.