Acts 20:31

Watch therefore, remembering that for the space of three years I ceased not by night and by day to warn every one with tears.

Matthew 24:24-25

for there shall rise up false Christs, and false prophets, who shall shew great signs and prodigies, so as to deceive, if possible, even the elect.

1 Corinthians 4:14

I do not write these things to shame you, but as my beloved children I admonish you:

1 Corinthians 10:12

Wherefore let him, that thinks he standeth, take heed least he fall.

Galatians 1:6-10

I wonder that ye are so soon removed from him who called you by the grace of Christ to another gospel: which is not another;

Galatians 2:11-13

But when Peter came to Antioch, I withstood him to the face, because he was indeed to be blamed.

Galatians 5:2-7

Behold, I Paul say unto you, that if ye be circumcised, Christ will profit you nothing.

Ephesians 4:17-21

This I say therefore, and charge you in the name of the Lord, that ye no longer walk as the rest of the Gentiles walk,

Ephesians 5:5-6

For this ye know, that no whoremonger, nor unclean person, nor covetous man, (who is an idolater,) hath any inheritance in the kingdom of Christ and of God.

Colossians 1:28

whom we preach, warning every man, and teaching every man in all wisdom, that we may present every man perfect in Christ Jesus:

Colossians 3:5-8

Mortify therefore your members that are upon the earth; fornication, uncleanness, disorderly passion, evil concupiscence, and insatiable desire, which is indeed idolatry:

1 Thessalonians 4:6-8

That no one over-reach, or wrong his brother in any thing: because the Lord is an avenger of all such crimes, as we also told you before, and testified to you.

1 Thessalonians 5:14

And admonish the disorderly, comfort the feeble-minded, support the weak, be of a patient spirit towards all.

1 Timothy 4:16

Take heed to thyself, and to thy doctrine; continue in them: for in doing this, thou wilt both save thyself and those that hear thee.

Titus 2:15

These things speak, and exhort; and reprove offenders with all authority: that none may despise thee.

James 5:20

let him know that he, who turneth back a sinner from the error of his way, shall save a soul from death, and shall cover a multitude of sins.

1 John 3:6-9

Whosoever abideth in Him sinneth not: whosoever sinneth hath not seen Him, nor known Him.

Revelation 3:19

Whomsoever I love, I reprove and chasten: be zealous therefore and repent.

Treasury of Scripture Knowledge

Summary

Nevertheless if thou warn the righteous man, that the righteous sin not, and he doth not sin, he shall surely live, because he is warned; also thou hast delivered thy soul.

Bible References

He shall

Galatians 2:11
But when Peter came to Antioch, I withstood him to the face, because he was indeed to be blamed.
James 5:20
let him know that he, who turneth back a sinner from the error of his way, shall save a soul from death, and shall cover a multitude of sins.

Also

1 Timothy 4:16
Take heed to thyself, and to thy doctrine; continue in them: for in doing this, thou wilt both save thyself and those that hear thee.