A. Use the Word to teach & warn them:

EZE 2:3. And he said unto me, Son of man, I send thee to the children of Israel, to a rebellious nation that hath rebelled against me: they and their fathers have transgressed against me, even unto this very day.

EZE 2:4. For they are impudent children and stiffhearted. I do send thee unto them; and thou shalt say unto them, Thus saith the Lord GOD.

EZE 2:5. And they, whether they will hear, or whether they will forbear, (for they are a rebellious house,) yet shall know that there hath been a prophet among them.

EZE 2:6. And thou, son of man, be not afraid of them, neither be afraid of their words, though briers and thorns be with thee, and thou dost dwell among scorpions: be not afraid of their words, nor be dismayed at their looks, though they be a rebellious house.

EZE 2:7. And thou shalt speak my words unto them, whether they will hear, or whether they will forbear: for they are most rebellious.

EZE 3:17. Son of man, I have made thee a watchman unto the house of Israel: therefore hear the word at my mouth, and give them warning from me.

EZE 3:18. When I say unto the wicked, Thou shalt surely die; and thou givest him not warning, nor speakest to warn the wicked from his wicked way, to save his life; the same wicked man shall die in his iniquity; but his blood will I require at thine hand.

B. Win them with your example not just your words:

1CO 9:19. For though I be free from all men, yet have I made myself servant unto all, that I might gain the more.

2TI 2:24. And the servant of the Lord must not strive; but be gentle unto all men, apt to teach, patient,

2TI 2:25. In meekness instructing those that oppose themselves; if God peradventure will give them repentance to the acknowledging of the truth;

2TI 2:26. And that they may recover themselves out of the snare of the devil, who are taken captive by him at his will.

1PE 3:1. Likewise, ye wives, be in subjection to your own husbands; that, if any obey not the word, they also may without the word be won by the conversation of the wives;

1PE 3:2. While they behold your chaste conversation coupled with fear.

1PE 3:3. Whose adorning let it not be that outward adorning of plaiting the hair, and of wearing of gold, or of putting on of apparel;

1PE 3:4. But let it be the hidden man of the heart, in that which is not corruptible, even the ornament of a meek and quiet spirit, which is in the sight of God of great price.

JAM 5:19. Brethren, if any of you do err from the truth, and one convert him;

JAM 5:20. Let him know, that he which converteth the sinner from the error of his way shall save a soul from death, and shall hide a multitude of sins

C. Try to get them to change:

LUK 1:17. And he shall go before him in the spirit and power of Elias, to turn the hearts of the fathers to the children, and the disobedient to the wisdom of the just; to make ready a people prepared for the Lord.

D. Keep an eye on them:

PRO 29:15. The rod and reproof give wisdom: but a child left to himself bringeth his mother to shame.

E. Do not keep company with them:

EPH 5:11. And have no fellowship with the unfruitful works of darkness, but rather reprove them.

2TH 3:6. Now we command you, brethren, in the name of our Lord Jesus Christ, that ye withdraw yourselves from every brother that walketh disorderly, and not after the tradition which he received of us.

2TH 3:14. And if any man obey not our word by this epistle, note that man, and have no company with him, that he may be ashamed.

1TI 6:3. If any man teach otherwise, and consent not to wholesome words, even the words of our Lord Jesus Christ, and to the doctrine which is according to godliness;

1TI 6:4. He is proud, knowing nothing, but doting about questions and strifes of words, whereof cometh envy, strife, railings, evil surmisings,

1TI 6:5. Perverse disputings of men of corrupt minds, and destitute of the truth, supposing that gain is godliness: from such withdraw thyself.

F. If the offence isn't serious don't give up on them:

2TH 3:14. And if any man obey not our word by this epistle, note that man, and have no company with him, that he may be ashamed.