Backslider

Relapse into bad ways or error.

Historically, backsliding was considered a trait of the Biblical Israel which would turn from the Abrahamic God to follow idols. 

Proverbs 14:14 The backslider in heart shall be filled with his own ways: and a good man [shall be satisfied] from himself.

Jeremiah warned Israel about this condition.

Jeremiah 2:19, 3:6, 3:8, 3:11-12, 3:14, 3:22, 5:6, 8:5, 14:7, 31:22, 49:4

Hosea also sounded the warning to the Nation of Israel.

Hosea 4:16, 11:7, 14:4

The word Backslider does not appear in the New Testament.

The apostle Paul warned the believers in the church of Galatia not to try to follow the LAW for salvation.

Galatians 3:1-3 O foolish Galatians, who hath bewitched you, that ye should not obey the truth, before whose eyes Jesus Christ hath been evidently set forth, crucified among you?  This only would I learn of you, Received ye the Spirit by the works of the law, or by the hearing of faith?  Are ye so foolish? having begun in the Spirit, are ye now made perfect by the flesh?

Galatians 3:9-13 So then they which be of faith are blessed with faithful Abraham. For as many as are of the works of the law are under the curse: for it is written, Cursed is every one that continueth not in all things which are written in the book of the law to do them. But that no man is justified by the law in the sight of God, it is evident: for, The just shall live by faith. And the law is not of faith: but, The man that doeth them shall live in them. Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written, Cursed is every one that hangeth on a tree:

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