Circumcise therefore the foreskin of your heart, and stiffen your neck no more.

Circumcise

Deuteronomy 30:6 The Lord thy God will circumcise thy heart, and the heart of thy seed: that thou mayst love the Lord thy God with all thy heart and with all thy soul, that thou mayst live.

Leviticus 26:41 Therefore I also will walk against them, and bring them into their enemies' land until their uncircumcised mind be ashamed. Then shall they pray for their sins.

Jeremiah 4:4,14 Be circumcised to the Lord, and take away the foreskins of your hearts, ye men of Juda, and ye inhabitants of Jerusalem: lest my indignation come forth like fire, and burn, and there be none that can quench it because of the wickedness of your thoughts. . . .

Romans 2:28,29 For it is not he is a Jew, who is so outwardly: nor is that circumcision which is outwardly in the flesh. . . .

Colossians 2:11 In whom also you are circumcised with circumcision not made by hand in despoiling of the body of the flesh: but in the circumcision of Christ.

stiff-necked

Deuteronomy 9:6,13 Know therefore that the Lord thy God giveth thee not this excellent land in possession for thy justices, for thou art a very stiffnecked people. . . .

Deuteronomy 31:27 For I know thy obstinacy, and thy most stiff neck. While I am yet living, and going in with you, you have always been rebellious against the Lord: how much more when I shall be dead?

James 4:6,7 But he giveth greater grace. Wherefore he saith: God resisteth the proud and giveth grace to the humble. . . .